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A018241 as a simple table

na(n)
11
21
32
432
54608
67028736
7132089118720
834998332896051200
9147462169661142781132800
1011008782516353752266715850342400
1116061608070479103314001351327405309952000
12500842967990688435516159987675099451681186775040000

[1,1,2,32,4608,7028736,132089118720,
 34998332896051200,147462169661142781132800,
 11008782516353752266715850342400,
 16061608070479103314001351327405309952000,
 50084296799068843551615998767509945168118677504000\
 0]