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A038156 as a simple table

n a(n)
0 0
1 0
2 2
3 9
4 40
5 205
6 1236
7 8659
8 69280
9 623529
10 6235300
11 68588311
12 823059744
13 10699776685
14 149796873604
15 2246953104075
16 35951249665216
17 611171244308689
18 11001082397556420
19 209020565553571999
20 4180411311071440000
21 87788637532500240021
22 1931350025715005280484

[0,0,2,9,40,205,1236,8659,69280,623529,6235300,
 68588311,823059744,10699776685,149796873604,
 2246953104075,35951249665216,611171244308689,
 11001082397556420,209020565553571999,
 4180411311071440000,87788637532500240021,
 1931350025715005280484]

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Last modified August 5 22:41 EDT 2021. Contains 346488 sequences. (Running on oeis4.)