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A056876 as a simple table

n a(n)
1 1
2 0
3 0
4 2
5 6
6 0
7 184
8 936
9 6688
10 0
11 420480
12 4298664
13 44405142
14 0
15 6732621476
16 92014579912
17 1345077232898
18 0
19 349174373111790
20 6179276762966832
21 114913276077265202
22 0

[1,0,0,2,6,0,184,936,6688,0,420480,4298664,
 44405142,0,6732621476,92014579912,1345077232898,0,
 349174373111790,6179276762966832,
 114913276077265202,0]

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Last modified May 17 15:47 EDT 2021. Contains 343980 sequences. (Running on oeis4.)