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A120583 as a simple table

n a(n)
1 0
2 0
3 6
4 24
5 102
6 468
7 2172
8 9978
9 45816
10 208686
11 944766
12 4253484
13 19046580
14 84891654
15 376756392
16 1665684774
17 7338822888
18 32233105398
19 141171369444
20 616694403366
21 2687630355198
22 11687756315940
23 50726031551790

[0,0,6,24,102,468,2172,9978,45816,208686,944766,
 4253484,19046580,84891654,376756392,1665684774,
 7338822888,32233105398,141171369444,616694403366,
 2687630355198,11687756315940,50726031551790]

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Last modified December 12 07:31 EST 2019. Contains 329948 sequences. (Running on oeis4.)