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A215587 as a simple table

n a(n)
0 1
1 0
2 0
3 3
4 0
5 10
6 90
7 308
8 1680
9 13560
10 123480
11 788568
12 7646760
13 76432720
14 841320480
15 8436217208
16 103473901440
17 1320024546240
18 17546621595840
19 235942960528128
20 3481689023521920
21 54132188358133120
22 858287202343992960
23 14187715233218409728
24 246498724782915369600

[1,0,0,3,0,10,90,308,1680,13560,123480,788568,
 7646760,76432720,841320480,8436217208,
 103473901440,1320024546240,17546621595840,
 235942960528128,3481689023521920,
 54132188358133120,858287202343992960,
 14187715233218409728,246498724782915369600]

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Last modified September 25 14:37 EDT 2022. Contains 356984 sequences. (Running on oeis4.)