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A004204 as a simple table

na(n)
11
21
30
44
520
6144
7630
85696
939366
10366400
113634950
1239066624
13479163828
146226534272
1587238701000
161315130458112
1720922813624336
18355586138666496
196402373841107998
20121479626301440000

[1,1,0,4,20,144,630,5696,39366,366400,3634950,
 39066624,479163828,6226534272,87238701000,
 1315130458112,20922813624336,355586138666496,
 6402373841107998,121479626301440000]