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A166997 as a simple table

na(n)
01
10
212
356
45404
5171664
6193729840
736639136064
8919064160383600
9937227332865348224
10699214061851483321467008
113577364560049979516493456896
1293123865010226899737836259608990464

[1,0,12,56,5404,171664,193729840,36639136064,
 919064160383600,937227332865348224,
 699214061851483321467008,
 3577364560049979516493456896,
 93123865010226899737836259608990464]