A305540 - cp's OEIS frontend

A305540 Triangle read by rows: T(n,k) is the number of achiral loops (necklaces or bracelets) of length n using exactly k different colors.

n	a(n)
1	1
2	1
3	1
4	1
5	2
6	1
7	4
8	3
9	1
10	6
11	6
12	1
13	10
14	21
15	12
16	1
17	14
18	36
19	24
20	1
21	22
22	93
23	132
24	60
25	1
26	30
27	150
28	240
29	120
30	1
31	46
32	345
33	900
34	960
35	360
36	1
37	62
38	540
39	1560
40	1800
41	720
42	1
43	94
44	1173
45	4980
46	9300
47	7920
48	2520
49	1
50	126
51	1806
52	8400
53	16800
54	15120
55	5040
56	1
57	190
58	3801
59	24612
60	71400
61	103320
62	73080
63	20160
64	1
65	254
66	5796
67	40824
68	126000
69	191520
70	141120
71	40320

[1, 1, 1, 1, 2, 1, 4, 3, 1, 6, 6, 1, 10, 21, 12, 1, 14, 36, 24, 1, 22, 93, 132, 60, 1, 30, 150, 240, 120, 1, 46, 345, 900, 960, 360, 1, 62, 540, 1560, 1800, 720, 1, 94, 1173, 4980, 9300, 7920, 2520, 1, 126, 1806, 8400, 16800, 15120, 5040, 1, 190, 3801, 24612, 71400, 103320, 73080, 20160, 1, 254, 5796, 40824, 126000, 191520, 141120, 40320]

cp's OEIS Frontend

A305540 Triangle read by rows: T(n,k) is the number of achiral loops (necklaces or bracelets) of length n using exactly k different colors.

Table of values

List of values