A308706 - cp's OEIS frontend

A308706 Number of chiral pairs of set partitions of a primitive cycle of n elements having exactly two different elements.

n	a(n)
0	0
1	0
2	0
3	0
4	0
5	0
6	0
7	1
8	2
9	7
10	12
11	31
12	58
13	126
14	233
15	484
16	904
17	1800
18	3395
19	6643
20	12612
21	24457
22	46655
23	90157
24	172750
25	333498
26	641214
27	1238664
28	2388618
29	4620006
30	8931536
31	17302033
32	33521792
33	65042495
34	126257160
35	245361171
36	477087772
37	928510506
38	1808145395
39	3523813566

[0, 0, 0, 0, 0, 0, 0, 1, 2, 7, 12, 31, 58, 126, 233, 484, 904, 1800, 3395, 6643, 12612, 24457, 46655, 90157, 172750, 333498, 641214, 1238664, 2388618, 4620006, 8931536, 17302033, 33521792, 65042495, 126257160, 245361171, 477087772, 928510506, 1808145395, 3523813566]

cp's OEIS Frontend

A308706 Number of chiral pairs of set partitions of a primitive cycle of n elements having exactly two different elements.

Table of values

List of values