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A222325 as a simple table

n a(n)
1 4
2 0
3 0
4 165
5 674
6 3770
7 15100
8 172590
9 759758
10 6657106
11 30994294
12 298933498
13 1368656291
14 12779873412
15 59202186592
16 560870492027
17 2605855916653
18 24609622243330
19 114661599066810
20 1086770275159481
21 5073242396321810

[4,0,0,165,674,3770,15100,172590,759758,6657106,
 30994294,298933498,1368656291,12779873412,
 59202186592,560870492027,2605855916653,
 24609622243330,114661599066810,1086770275159481,
 5073242396321810]

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Last modified December 1 22:12 EST 2021. Contains 349435 sequences. (Running on oeis4.)