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A221788 as a simple table

n a(n)
1 0
2 0
3 0
4 5
5 24
6 142
7 840
8 4919
9 28704
10 167344
11 975408
12 5685161
13 33135624
14 193128658
15 1125636408
16 6560689883
17 38238502992
18 222870328180
19 1298983466208
20 7571030469197
21 44127199349112
22 257192165625622
23 1499025794404776

[0,0,0,5,24,142,840,4919,28704,167344,975408,
 5685161,33135624,193128658,1125636408,6560689883,
 38238502992,222870328180,1298983466208,
 7571030469197,44127199349112,257192165625622,
 1499025794404776]

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Last modified January 26 13:47 EST 2021. Contains 340439 sequences. (Running on oeis4.)