A191718 - cp's OEIS frontend

A191718 a(n,k) is the count of permutations with cycle length k in the products w*w over all permutations w of length n.

n	a(n)
1	1
2	0
3	2
4	2
5	0
6	4
7	0
8	14
9	0
10	10
11	24
12	0
13	70
14	0
15	26
16	0
17	304
18	0
19	340
20	0
21	76
22	720
23	0
24	2548
25	0
26	1540
27	0
28	232
29	0
30	13488
31	0
32	18956
33	0
34	7112
35	0
36	764
37	40320
38	0
39	161936
40	0
41	125580
42	0
43	32424
44	0
45	2620
46	0
47	1011456
48	0
49	1648160
50	0
51	808248
52	0
53	151440
54	0
55	9496
56	3628800

[1, 0, 2, 2, 0, 4, 0, 14, 0, 10, 24, 0, 70, 0, 26, 0, 304, 0, 340, 0, 76, 720, 0, 2548, 0, 1540, 0, 232, 0, 13488, 0, 18956, 0, 7112, 0, 764, 40320, 0, 161936, 0, 125580, 0, 32424, 0, 2620, 0, 1011456, 0, 1648160, 0, 808248, 0, 151440, 0, 9496, 3628800]

cp's OEIS Frontend

A191718 a(n,k) is the count of permutations with cycle length k in the products w*w over all permutations w of length n.

Table of values

List of values