A268556 - cp's OEIS frontend

A268556 Number of pairs (tau, sigma) of permutations of a set of size 4*n, where tau (resp. sigma) has only 2-cycles (resp. 4-cycles), up to simultaneous conjugacy.

n	a(n)
0	1
1	2
2	10
3	54
4	491
5	6430
6	119475
7	2775582
8	76733201
9	2439149685
10	87453344290
11	3488115999471
12	153144951882415
13	7338420391031823
14	381071098250317995
15	21315652618569993733
16	1277715228291442258979
17	81707184260073101216920
18	5552193525061715345715130
19	399514236526927579390940395

[1, 2, 10, 54, 491, 6430, 119475, 2775582, 76733201, 2439149685, 87453344290, 3488115999471, 153144951882415, 7338420391031823, 381071098250317995, 21315652618569993733, 1277715228291442258979, 81707184260073101216920, 5552193525061715345715130, 399514236526927579390940395]

cp's OEIS Frontend

A268556 Number of pairs (tau, sigma) of permutations of a set of size 4*n, where tau (resp. sigma) has only 2-cycles (resp. 4-cycles), up to simultaneous conjugacy.

Table of values

List of values