Sum of digits of (2^n)!.

Terms

a(0) =1a(1) =2a(2) =6a(3) =9a(4) =63a(5) =108a(6) =324a(7) =828a(8) =1989a(9) =4635a(10) =10845a(11) =24363a(12) =54279a(13) =118827a(14) =258705a(15) =565389a(16) =1216134a(17) =2611359a(18) =5584518a(19) =11875977a(20) =25184205a(21) =53209728a(22) =112069377a(23) =235502361a(24) =493827687a(25) =1033041267a(26) =2156974227a(27) =4495662081a(28) =9355185828a(29) =19437382512