A072506 - cp's OEIS frontend

A072506 Triangle giving T(n,m) = number of necklaces of two colors with 2n beads of which m=1..n are black.

n	a(n)
1	1
2	1
3	2
4	1
5	3
6	4
7	1
8	4
9	7
10	10
11	1
12	5
13	12
14	22
15	26
16	1
17	6
18	19
19	43
20	66
21	80
22	1
23	7
24	26
25	73
26	143
27	217
28	246
29	1
30	8
31	35
32	116
33	273
34	504
35	715
36	810
37	1
38	9
39	46
40	172
41	476
42	1038
43	1768
44	2438
45	2704
46	1
47	10
48	57
49	245
50	776
51	1944
52	3876
53	6310
54	8398
55	9252
56	1
57	11
58	70
59	335
60	1197
61	3399
62	7752

[1, 1, 2, 1, 3, 4, 1, 4, 7, 10, 1, 5, 12, 22, 26, 1, 6, 19, 43, 66, 80, 1, 7, 26, 73, 143, 217, 246, 1, 8, 35, 116, 273, 504, 715, 810, 1, 9, 46, 172, 476, 1038, 1768, 2438, 2704, 1, 10, 57, 245, 776, 1944, 3876, 6310, 8398, 9252, 1, 11, 70, 335, 1197, 3399, 7752]

cp's OEIS Frontend

A072506 Triangle giving T(n,m) = number of necklaces of two colors with 2n beads of which m=1..n are black.

Table of values

List of values