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A128721 as a simple table

n a(n)
0 0
1 0
2 0
3 4
4 28
5 157
6 820
7 4155
8 20742
9 102725
10 506504
11 2491230
12 12236520
13 60063399
14 294748884
15 1446436680
16 7099442700
17 34855583275
18 171187439920
19 841084246980
20 4134129246180
21 20328683526575
22 100003531112300
23 492153054177155

[0,0,0,4,28,157,820,4155,20742,102725,506504,
 2491230,12236520,60063399,294748884,1446436680,
 7099442700,34855583275,171187439920,841084246980,
 4134129246180,20328683526575,100003531112300,
 492153054177155]

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Last modified September 26 14:12 EDT 2022. Contains 356999 sequences. (Running on oeis4.)