A246072 - cp's OEIS frontend

A246072 Number A(n,k) of permutations p on [2n] satisfying p^k(i) = i for all i in [n]; square array A(n,k), n>=0, k>=0, read by antidiagonals.

n	a(n)
0	1
1	1
2	2
3	1
4	1
5	24
6	1
7	2
8	2
9	720
10	1
11	1
12	10
13	6
14	40320
15	1
16	2
17	10
18	84
19	24
20	3628800
21	1
22	1
23	16
24	108
25	1032
26	120
27	479001600
28	1
29	2
30	2
31	264
32	1800
33	17040
34	720
35	87178291200
36	1
37	1
38	18
39	150
40	6672
41	47520
42	359280
43	5040
44	20922789888000

[1, 1, 2, 1, 1, 24, 1, 2, 2, 720, 1, 1, 10, 6, 40320, 1, 2, 10, 84, 24, 3628800, 1, 1, 16, 108, 1032, 120, 479001600, 1, 2, 2, 264, 1800, 17040, 720, 87178291200, 1, 1, 18, 150, 6672, 47520, 359280, 5040, 20922789888000]

cp's OEIS Frontend

A246072 Number A(n,k) of permutations p on [2n] satisfying p^k(i) = i for all i in [n]; square array A(n,k), n>=0, k>=0, read by antidiagonals.

Table of values

List of values