A235940 - OEIS

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A235940 as a simple table

n	a(n)
1	0
2	0
3	0
4	0
5	10
6	24
7	154
8	992
9	7344
10	61120
11	568062
12	5827248
13	65449878
14	799122856
15	10541495760
16	149434080256
17	2265793149218
18	36594799613064
19	627269647629538
20	11373729261469680
21	217514607586602480

[0,0,0,0,10,24,154,992,7344,61120,568062,5827248, 65449878,799122856,10541495760,149434080256, 2265793149218,36594799613064,627269647629538, 11373729261469680,217514607586602480]