A027490 - OEIS

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A027490 as a simple table

n	a(n)
2	1
3	39
4	2951
5	407450
6	94128364
7	33910601508
8	18030534782364
9	13546779499777104
10	13886615636338251456
11	18871622607827176957440
12	33195072622146083265245760
13	74062306101954993414777244800

[1,39,2951,407450,94128364,33910601508, 18030534782364,13546779499777104, 13886615636338251456,18871622607827176957440, 33195072622146083265245760, 74062306101954993414777244800]