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A046873 as a simple table

na(n)
01
11
22
348
41680384
514807804035657359360
6141377911697227887117195970316200795630205476957716480

[1,1,2,48,1680384,14807804035657359360,
 14137791169722788711719597031620079563020547695771\
 6480]