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A056990 as a simple table

na(n)
01
12
28
3192
422272
511550720
625629327360
7236229525504000
88858686914082897920
91331751782100764385607680

[1,2,8,192,22272,11550720,25629327360,
 236229525504000,8858686914082897920,
 1331751782100764385607680]