Irregular table T(n,k) = Product_{j = 1..k} prime(j)^(n-j+1), n >= 0, k = 1..n.

Terms

a(0) =1a(1) =2a(2) =4a(3) =12a(4) =8a(5) =72a(6) =360a(7) =16a(8) =432a(9) =10800a(10) =75600a(11) =32a(12) =2592a(13) =324000a(14) =15876000a(15) =174636000a(16) =64a(17) =15552a(18) =9720000a(19) =3333960000a(20) =403409160000a(22) =128a(23) =93312a(24) =291600000a(25) =700131600000