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A012711 as a simple table

na(n)
00
11
22
36
424
5168
61360
714280
8170688
92420096
1038403328
11687737600
1213562531840
13293985622656
146920272523008
15176170136886016
164816418604806144
17140839702493749248
184384422821203968000

[0,1,2,6,24,168,1360,14280,170688,2420096,
 38403328,687737600,13562531840,293985622656,
 6920272523008,176170136886016,4816418604806144,
 140839702493749248,4384422821203968000]