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A019013 as a simple table

n a(n)
2 4
3 4
4 16
5 160
6 852
7 4732
8 30184
9 189504
10 1205100
11 7852748
12 51742664
13 345137460
14 2326824304
15 15824261632
16 108475583464

[4,4,16,160,852,4732,30184,189504,1205100,7852748,
 51742664,345137460,2326824304,15824261632,
 108475583464]

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Last modified May 29 02:32 EDT 2020. Contains 334696 sequences. (Running on oeis4.)