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A281883 as a simple table

n a(n)
1 0
2 0
3 68
4 638
5 4832
6 35002
7 241209
8 1612568
9 10566034
10 68136376
11 433938423
12 2736019588
13 17108229189
14 106234294380
15 655764472080
16 4027264205666
17 24622851384305
18 149957156910166
19 910104036599313
20 5506462499669112

[0,0,68,638,4832,35002,241209,1612568,10566034,
 68136376,433938423,2736019588,17108229189,
 106234294380,655764472080,4027264205666,
 24622851384305,149957156910166,910104036599313,
 5506462499669112]

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Last modified May 25 10:05 EDT 2022. Contains 354066 sequences. (Running on oeis4.)