| Number n of carbon Atoms | Isomers of CnH2n+2 |
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 2 |
| 5 | 3 |
| 6 | 5 |
| 7 | 9 |
| 8 | 18 |
| 9 | 35 |
| 10 | 75 |
| 11 | 159 |
| 12 | 355 |
| 13 | 802 |
| 14 | 1858 |
| 15 | 4347 |
| 16 | 10359 |
| 17 | 24894 |
| 18 | 60523 |
| 19 | 148284 |
| 20 | 366319 |
| 21 | 910726 |
| 22 | 2278658 |
| 23 | 5731580 |
| 24 | 14490245 |
| 25 | 36797588 |
| 26 | 93839412 |
| 27 | 240215803 |
| 28 | 617105614 |
| 29 | 1590507121 |
| 30 | 4111846763 |
| 31 | 10660307791 |
| 32 | 27711253769 |
| 33 | 72214088660 |
| 34 | 188626236139 |
| 35 | 493782952902 |
| 36 | 1295297588128 |
| 37 | 3404490780161 |
| 38 | 8964747474595 |
| 39 | 23647478933969 |
| 40 | 62481801147341 |
| 41 | 165351455535782 |
| 42 | 438242894769226 |
| 43 | 1163169707886427 |
| 44 | 3091461011836856 |
| 45 | 8227162372221203 |
| 46 | 21921834086683418 |
| 47 | 58481806621987010 |
| 48 | 156192366474590639 |
| 49 | 417612400765382272 |
| 50 | 1117743651746953270 |
| 51 | 2994664179967370611 |
| 52 | 8031081780535296591 |
| 53 | 21557771913572630901 |
| 54 | 57919180873148437753 |
| 55 | 155745431857549699124 |
| 56 | 419149571193411829372 |
| 57 | 1128939578361332867936 |
| 58 | 3043043571906827182530 |
| 59 | 8208615366863753915949 |
| 60 | 22158734535770411074184 |
| 61 | 59858097847706865855186 |
| 62 | 161805725349297357221898 |
| 63 | 437671691526158936922623 |
| 64 | 1184616185385310843585573 |
| 65 | 3208285066181475821271463 |
| 66 | 8694130712024868414002815 |
| 67 | 23573796134448175745408811 |
| 68 | 63955159527348138708694312 |
| 69 | 173603007393950249896865875 |
| 70 | 471484798515330363034639871 |
| 71 | 1281151315764638215613845510 |
| 72 | 3482965749140691245110434511 |
| 73 | 9473447386804490449091871124 |
| 74 | 25779306238954404972323916397 |
| 75 | 70183211512214096492433058105 |
| 76 | 191156381393249393027319384769 |
| 77 | 520874195248906781713044332539 |
| 78 | 1419908915343952137338409797325 |
| 79 | 3872282575137005474139119076135 |
| 80 | 10564476906946675106953415600016 |
| 81 | 28833609436277333169440806135431 |
| 82 | 78725585464391037293036629979444 |
| 83 | 215027809474796675607407513633870 |
| 84 | 587531723826577193455385789266377 |
| 85 | 1605913778494711520354663202536756 |
| 86 | 4391002908093323425994602631972445 |
| 87 | 12010257907756938974208750945664835 |
| 88 | 32861295558120887536942123568548502 |
| 89 | 89940959024891576997396491928932689 |
| 90 | 246245150242821439632304475956113295 |
| 91 | 674391606297983432514229725117306224 |
| 92 | 1847515048012613337782670842346319120 |
| 93 | 5062818112121161180862827915688625902 |
| 94 | 13877857529584521384324419956411729295 |
| 95 | 38051836070803837001309074456088423358 |
| 96 | 104363664561059273927704242814298678658 |
| 97 | 286312976836850192359345859166390622180 |
| 98 | 785684759853087702778573182234297830503 |
| 99 | 2156596319845084996862701478402986311496 |
| 100 | 5921072038125809849884993369103538010139 |