Least positive integer k for which 2^n divides k!.

Terms

a(0) =1a(1) =2a(2) =4a(3) =4a(4) =6a(5) =8a(6) =8a(7) =8a(8) =10a(9) =12a(10) =12a(11) =14a(12) =16a(13) =16a(14) =16a(15) =16a(16) =18a(17) =20a(18) =20a(19) =22a(20) =24a(21) =24a(22) =24a(23) =26a(24) =28a(25) =28a(26) =30a(27) =32a(28) =32a(29) =32