Least positive integer k for which 8^n divides k!.

Terms

a(0) =1a(1) =4a(2) =8a(3) =12a(4) =16a(5) =16a(6) =20a(7) =24a(8) =28a(9) =32a(10) =32a(11) =36a(12) =40a(13) =42a(14) =46a(15) =48a(16) =52a(17) =56a(18) =58a(19) =62a(20) =64a(21) =64a(22) =68a(23) =72a(24) =76a(25) =80a(26) =80a(27) =84a(28) =88a(29) =92