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A001625 as a simple table

n a(n)
2 2
3 4
4 60
5 1276
6 41888
7 1916064
8 116522048
9 9069595840
10 878460379392
11 103547791177216
12 14588580791234048
13 2420219602973093376
14 466877775127725240320
15 103607067936116866084864
16 26204424894484840874483712

[2,4,60,1276,41888,1916064,116522048,9069595840,
 878460379392,103547791177216,14588580791234048,
 2420219602973093376,466877775127725240320,
 103607067936116866084864,
 26204424894484840874483712]

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Last modified November 12 16:50 EST 2018. Contains 317116 sequences. (Running on oeis4.)