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A056351 as a simple table

na(n)
10
20
30
40
512
6150
71200
87905
946400
10255624
111346700
126901575
1334663020
14171785250
15843130676
164110950625
1719951305240
1896528446150
19466073976900
202247626821095
2110832193570260
2252194107870250

[0,0,0,0,12,150,1200,7905,46400,255624,1346700,
 6901575,34663020,171785250,843130676,4110950625,
 19951305240,96528446150,466073976900,
 2247626821095,10832193570260,52194107870250]