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A264581 as a simple table

n a(n)
1 1
2 56
3 333
4 2232
5 30718
6 314166
7 2561017
8 24729380
9 248623843
10 2294091610
11 21321186497
12 204951390856
13 1942216548168
14 18230545326138
15 172631845704811
16 1636624660988864
17 15453906528343116
18 146032030188390140

[1,56,333,2232,30718,314166,2561017,24729380,
 248623843,2294091610,21321186497,204951390856,
 1942216548168,18230545326138,172631845704811,
 1636624660988864,15453906528343116,
 146032030188390140]

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Last modified October 24 19:11 EDT 2020. Contains 338009 sequences. (Running on oeis4.)