A209485 - cp's OEIS frontend

A209485 T(n,k) is the number of n-bead necklaces labeled with numbers -k..k allowing reversal, with sum zero and avoiding the patterns z z+1 z+2 and z z-1 z-2.

n	a(n)
1	1
2	1
3	2
4	1
5	3
6	1
7	1
8	4
9	4
10	4
11	1
12	5
13	7
14	15
15	4
16	1
17	6
18	12
19	35
20	38
21	11
22	1
23	7
24	17
25	72
26	140
27	136
28	15
29	1
30	8
31	24
32	128
33	390
34	731
35	458
36	43
37	1
38	9
39	31
40	205
41	866
42	2606
43	3740
44	1781
45	77
46	1
47	10
48	40
49	311
50	1702
51	7179
52	17771
53	20888
54	6912
55	199
56	1
57	11
58	49
59	448
60	3014
61	16660
62	60778
63	128598
64	118137

[1, 1, 2, 1, 3, 1, 1, 4, 4, 4, 1, 5, 7, 15, 4, 1, 6, 12, 35, 38, 11, 1, 7, 17, 72, 140, 136, 15, 1, 8, 24, 128, 390, 731, 458, 43, 1, 9, 31, 205, 866, 2606, 3740, 1781, 77, 1, 10, 40, 311, 1702, 7179, 17771, 20888, 6912, 199, 1, 11, 49, 448, 3014, 16660, 60778, 128598, 118137]

cp's OEIS Frontend

A209485 T(n,k) is the number of n-bead necklaces labeled with numbers -k..k allowing reversal, with sum zero and avoiding the patterns z z+1 z+2 and z z-1 z-2.

Table of values

List of values