A304972 - cp's OEIS frontend

A304972 Triangle read by rows of achiral color patterns (set partitions) for a row or loop of length n. T(n,k) is the number using exactly k colors (sets).

n	a(n)
1	1
2	1
3	1
4	1
5	1
6	1
7	1
8	3
9	2
10	1
11	1
12	3
13	5
14	2
15	1
16	1
17	7
18	10
19	9
20	3
21	1
22	1
23	7
24	19
25	16
26	12
27	3
28	1
29	1
30	15
31	38
32	53
33	34
34	18
35	4
36	1
37	1
38	15
39	65
40	90
41	95
42	46
43	22
44	4
45	1
46	1
47	31
48	130
49	265
50	261
51	195
52	80
53	30
54	5
55	1
56	1
57	31
58	211
59	440
60	630
61	461
62	295
63	100
64	35
65	5
66	1
67	1
68	63
69	422
70	1221
71	1700
72	1696
73	1016
74	515
75	155
76	45
77	6
78	1
79	1
80	63
81	665
82	2002

[1, 1, 1, 1, 1, 1, 1, 3, 2, 1, 1, 3, 5, 2, 1, 1, 7, 10, 9, 3, 1, 1, 7, 19, 16, 12, 3, 1, 1, 15, 38, 53, 34, 18, 4, 1, 1, 15, 65, 90, 95, 46, 22, 4, 1, 1, 31, 130, 265, 261, 195, 80, 30, 5, 1, 1, 31, 211, 440, 630, 461, 295, 100, 35, 5, 1, 1, 63, 422, 1221, 1700, 1696, 1016, 515, 155, 45, 6, 1, 1, 63, 665, 2002]

cp's OEIS Frontend

A304972 Triangle read by rows of achiral color patterns (set partitions) for a row or loop of length n. T(n,k) is the number using exactly k colors (sets).

Table of values

List of values