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A002686 as a simple table

n a(n)
1 1
2 8
3 45
4 416
5 1685
6 31032
7 1603182
8 13856896
9 132843888
10 6551143600

[1,8,45,416,1685,31032,1603182,13856896,132843888,
 6551143600]

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Last modified March 25 16:26 EDT 2019. Contains 321470 sequences. (Running on oeis4.)