The number of digits of (2^n)!.

Terms

a(0) =1a(1) =1a(2) =2a(3) =5a(4) =14a(5) =36a(6) =90a(7) =216a(8) =507a(9) =1167a(10) =2640a(11) =5895a(12) =13020a(13) =28504a(14) =61937a(15) =133734a(16) =287194a(17) =613842a(18) =1306594a(19) =2771010a(20) =5857670a(21) =12346641a(22) =25955890a(23) =54436999a(24) =113924438a(25) =237949763a(26) =496101303a(27) =1032606162a(28) =2146019444a(29) =4453653132