A000642 - cp's OEIS frontend

A000642 a(1)=0; for n>1, a(n) = number of isomeric hydrocarbons of the acetylene series with carbon content n.

n	a(n)
1	0
2	1
3	1
4	2
5	3
6	7
7	14
8	32
9	72
10	171
11	405
12	989
13	2426
14	6045
15	15167
16	38422
17	97925
18	251275
19	648061
20	1679869
21	4372872
22	11428365
23	29972078
24	78859809
25	208094977
26	550603722
27	1460457242
28	3882682803
29	10344102122
30	27612603765
31	73844151259
32	197818389539

[0, 1, 1, 2, 3, 7, 14, 32, 72, 171, 405, 989, 2426, 6045, 15167, 38422, 97925, 251275, 648061, 1679869, 4372872, 11428365, 29972078, 78859809, 208094977, 550603722, 1460457242, 3882682803, 10344102122, 27612603765, 73844151259, 197818389539]

cp's OEIS Frontend

A000642 a(1)=0; for n>1, a(n) = number of isomeric hydrocarbons of the acetylene series with carbon content n.

Table of values

List of values