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A018934 as a simple table

n a(n)
0 0
1 0
2 0
3 2
4 8
5 42
6 256
7 1810
8 14568
9 131642
10 1320128
11 14551074
12 174879880
13 2276108362
14 31894886208
15 478775722802
16 7664993150696
17 130369025763930
18 2347604596782208
19 44619881467365442
20 892659329531868168
21 18750556523491299434
22 412601744979927877760
23 9491630163800726992722

[0,0,0,2,8,42,256,1810,14568,131642,1320128,
 14551074,174879880,2276108362,31894886208,
 478775722802,7664993150696,130369025763930,
 2347604596782208,44619881467365442,
 892659329531868168,18750556523491299434,
 412601744979927877760,9491630163800726992722]

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Last modified April 13 13:24 EDT 2021. Contains 342936 sequences. (Running on oeis4.)