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A229666 as a simple table

n a(n)
1 0
2 4
3 61
4 652
5 5048
6 33152
7 197248
8 1098752
9 5838848
10 29949952
11 149454848
12 729546752
13 3497525248
14 16517169152
15 77015810048
16 355207217152
17 1622826549248
18 7352984010752
19 33073395662848
20 147798414589952
21 656648959950848

[0,4,61,652,5048,33152,197248,1098752,5838848,
 29949952,149454848,729546752,3497525248,
 16517169152,77015810048,355207217152,
 1622826549248,7352984010752,33073395662848,
 147798414589952,656648959950848]

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Last modified October 22 10:39 EDT 2021. Contains 348160 sequences. (Running on oeis4.)