A300931 - cp's OEIS frontend

A300931 a(n) is the number of Klein four orbits of permutations generated by the operations of inverse permutation and conjugation by w_0 = [n, n-1, ..., 1].

n	a(n)
0	1
1	1
2	2
3	4
4	13
5	45
6	230
7	1388
8	10558
9	92126
10	912908
11	9998008
12	119831996
13	1557050972
14	21795929320
15	326923928048
16	5230723155848
17	88921965504136
18	1600593971537552
19	30411277553507360
20	608225514852464848
21	12772735603832679248
22	281000182274281641056

[1, 1, 2, 4, 13, 45, 230, 1388, 10558, 92126, 912908, 9998008, 119831996, 1557050972, 21795929320, 326923928048, 5230723155848, 88921965504136, 1600593971537552, 30411277553507360, 608225514852464848, 12772735603832679248, 281000182274281641056]

cp's OEIS Frontend

A300931 a(n) is the number of Klein four orbits of permutations generated by the operations of inverse permutation and conjugation by w_0 = [n, n-1, ..., 1].

Table of values

List of values