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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]

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Last modified October 13 20:38 EDT 2019. Contains 327981 sequences. (Running on oeis4.)