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A122827 as a simple table

n a(n)
1 1
2 0
3 1
4 6
5 39
6 284
7 2305
8 20682
9 203651
10 2186744
11 25463925
12 319989030
13 4320183527
14 62412737460
15 961264517369
16 15730347890082
17 272650924761195
18 4991218317261808
19 96248879172426557
20 1950405560049871134
21 41440841509597888495
22 921333064567137032620
23 21392807067461981820417

[1,0,1,6,39,284,2305,20682,203651,2186744,
 25463925,319989030,4320183527,62412737460,
 961264517369,15730347890082,272650924761195,
 4991218317261808,96248879172426557,
 1950405560049871134,41440841509597888495,
 921333064567137032620,21392807067461981820417]

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Last modified June 13 05:41 EDT 2021. Contains 344981 sequences. (Running on oeis4.)