A121352 - cp's OEIS frontend

A121352 Number of different, not necessarily connected, unlabeled trivalent diagrams of size n.

n	a(n)
0	1
1	1
2	2
3	4
4	7
5	10
6	24
7	37
8	63
9	112
10	200
11	318
12	607
13	1058
14	1814
15	3247
16	6004
17	10316
18	19048
19	35478
20	63496
21	117023
22	223822
23	408121
24	766661
25	1484363
26	2775201
27	5270079
28	10357605
29	19714259
30	37970066
31	75439670
32	146103241
33	284719527
34	571706625
35	1123396477
36	2214903209

[1, 1, 2, 4, 7, 10, 24, 37, 63, 112, 200, 318, 607, 1058, 1814, 3247, 6004, 10316, 19048, 35478, 63496, 117023, 223822, 408121, 766661, 1484363, 2775201, 5270079, 10357605, 19714259, 37970066, 75439670, 146103241, 284719527, 571706625, 1123396477, 2214903209]

cp's OEIS Frontend

A121352 Number of different, not necessarily connected, unlabeled trivalent diagrams of size n.

Table of values

List of values