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A054915 as a simple table

n a(n)
1 1
2 0
3 0
4 1
5 8
6 68
7 662
8 9888
9 247492
10 11427974
11 994403266
12 163028488360
13 50169784370486
14 28952819268460634
15 31368276315718175152
16 63938104521922794457626
17 245807799210635120355337360
18 1787085725352186477232522962312
19 24634233605674730786262294027930520

[1,0,0,1,8,68,662,9888,247492,11427974,994403266,
 163028488360,50169784370486,28952819268460634,
 31368276315718175152,63938104521922794457626,
 245807799210635120355337360,
 1787085725352186477232522962312,
 24634233605674730786262294027930520]

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Last modified June 6 11:14 EDT 2020. Contains 334827 sequences. (Running on oeis4.)