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A053426 as a simple table

na(n)
11
21
34
435
510688
61533771392
7234249157811872000
8128777207192421762546956433408
91031041719465866666816675423468078224724119552

[1,1,4,35,10688,1533771392,234249157811872000,
 128777207192421762546956433408,
 1031041719465866666816675423468078224724119552]