A304973 - cp's OEIS frontend

A304973 Number of achiral color patterns (set partitions) for a row or loop of length n using exactly 3 colors (sets).

n	a(n)
0	0
1	0
2	0
3	1
4	2
5	5
6	10
7	19
8	38
9	65
10	130
11	211
12	422
13	665
14	1330
15	2059
16	4118
17	6305
18	12610
19	19171
20	38342
21	58025
22	116050
23	175099
24	350198
25	527345
26	1054690
27	1586131
28	3172262
29	4766585
30	9533170
31	14316139
32	28632278
33	42981185
34	85962370
35	129009091
36	258018182
37	387158345
38	774316690
39	1161737179
40	2323474358

[0, 0, 0, 1, 2, 5, 10, 19, 38, 65, 130, 211, 422, 665, 1330, 2059, 4118, 6305, 12610, 19171, 38342, 58025, 116050, 175099, 350198, 527345, 1054690, 1586131, 3172262, 4766585, 9533170, 14316139, 28632278, 42981185, 85962370, 129009091, 258018182, 387158345, 774316690, 1161737179, 2323474358]

cp's OEIS Frontend

A304973 Number of achiral color patterns (set partitions) for a row or loop of length n using exactly 3 colors (sets).

Table of values

List of values