Product of nonzero remainders of n mod k, for k = 1,2,3,...,n.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =2a(6) =6a(7) =12a(8) =24a(9) =48a(10) =720a(11) =240a(12) =2160a(13) =23040a(14) =45360a(15) =40320a(16) =2419200a(17) =1935360a(18) =65318400a(19) =69672960a(20) =163296000a(21) =2786918400a(22) =754427520000a(23) =22992076800a(24) =201180672000