If n = Sum (2^e_k) then a(n) = Product ((e_k + 2)!).

Terms

a(0) =1a(1) =2a(2) =6a(3) =12a(4) =24a(5) =48a(6) =144a(7) =288a(8) =120a(9) =240a(10) =720a(11) =1440a(12) =2880a(13) =5760a(14) =17280a(15) =34560a(16) =720a(17) =1440a(18) =4320a(19) =8640a(20) =17280a(21) =34560a(22) =103680a(23) =207360a(24) =86400a(25) =172800a(26) =518400a(27) =1036800a(28) =2073600a(29) =4147200