The pi-based arithmetic derivative of n!.

Terms

a(0) =0a(1) =0a(2) =1a(3) =7a(4) =52a(5) =332a(6) =2832a(7) =22704a(8) =242112a(9) =2662848a(10) =30620160a(11) =354965760a(12) =5057925120a(13) =68627036160