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A115752 as a simple table

n a(n)
0 0
1 0
2 3
3 4
4 15
5 81
6 168
7 540
8 2271
9 5365
10 16698
11 63229
12 159250
13 489048
14 1749933
15 4576140
16 13955895
17 48211389
18 129211818
19 392441049
20 1323741156
21 3609608838
22 10933915743
23 36252591813
24 100126350090
25 302737691646
26 990855646563

[0,0,3,4,15,81,168,540,2271,5365,16698,63229,
 159250,489048,1749933,4576140,13955895,48211389,
 129211818,392441049,1323741156,3609608838,
 10933915743,36252591813,100126350090,302737691646,
 990855646563]

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Last modified July 8 18:55 EDT 2020. Contains 335524 sequences. (Running on oeis4.)