A291909 - cp's OEIS frontend

A291909 Triangle read by rows: T(n,k) is the coefficient of x^(2*k) in the cycle polynomial of the complete bipartite graph K_{n,n}, 1 <= k <= n.

n	a(n)
1	0
2	0
3	1
4	0
5	9
6	6
7	0
8	36
9	96
10	72
11	0
12	100
13	600
14	1800
15	1440
16	0
17	225
18	2400
19	16200
20	51840
21	43200
22	0
23	441
24	7350
25	88200
26	635040
27	2116800
28	1814400
29	0
30	784
31	18816
32	352800
33	4515840
34	33868800
35	116121600
36	101606400
37	0
38	1296
39	42336
40	1143072
41	22861440
42	304819200
43	2351462400
44	8230118400
45	7315660800

[0, 0, 1, 0, 9, 6, 0, 36, 96, 72, 0, 100, 600, 1800, 1440, 0, 225, 2400, 16200, 51840, 43200, 0, 441, 7350, 88200, 635040, 2116800, 1814400, 0, 784, 18816, 352800, 4515840, 33868800, 116121600, 101606400, 0, 1296, 42336, 1143072, 22861440, 304819200, 2351462400, 8230118400, 7315660800]

cp's OEIS Frontend

A291909 Triangle read by rows: T(n,k) is the coefficient of x^(2*k) in the cycle polynomial of the complete bipartite graph K_{n,n}, 1 <= k <= n.

Table of values

List of values