A189980 - cp's OEIS frontend

A189980 a(n) is the number of incongruent two-color bracelets of n beads, 10 from them are black (A005515), having a diameter of symmetry.

n	a(n)
10	1
11	1
12	6
13	6
14	21
15	21
16	56
17	56
18	126
19	126
20	252
21	252
22	462
23	462
24	792
25	792
26	1287
27	1287
28	2002
29	2002
30	3003
31	3003
32	4368
33	4368
34	6188
35	6188
36	8568
37	8568
38	11628
39	11628
40	15504
41	15504
42	20349
43	20349
44	26334
45	26334
46	33649
47	33649

[1, 1, 6, 6, 21, 21, 56, 56, 126, 126, 252, 252, 462, 462, 792, 792, 1287, 1287, 2002, 2002, 3003, 3003, 4368, 4368, 6188, 6188, 8568, 8568, 11628, 11628, 15504, 15504, 20349, 20349, 26334, 26334, 33649, 33649]

cp's OEIS Frontend

A189980 a(n) is the number of incongruent two-color bracelets of n beads, 10 from them are black (A005515), having a diameter of symmetry.

Table of values

List of values