A235938 - OEIS

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A235938 as a simple table

n	a(n)
1	0
2	0
3	0
4	0
5	2
6	4
7	22
8	124
9	816
10	6112
11	51642
12	485604
13	5034606
14	57080204
15	702766384
16	9339630016
17	133281949954
18	2033044422948
19	33014191980502
20	568686463073484
21	10357838456504880

[0,0,0,0,2,4,22,124,816,6112,51642,485604,5034606, 57080204,702766384,9339630016,133281949954, 2033044422948,33014191980502,568686463073484, 10357838456504880]