A047057 - OEIS

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A047057 as a simple table

n	a(n)
1	0
2	0
3	24
4	192
5	1032
6	5376
7	26688
8	128880
9	605664
10	2802576
11	12755136
12	57525552
13	256574352
14	1137418464
15	5001796944
16	21899428128
17	95296531680
18	413331190896

[0,0,24,192,1032,5376,26688,128880,605664,2802576, 12755136,57525552,256574352,1137418464,5001796944, 21899428128,95296531680,413331190896]