a(n) = product of {p^k : p | n, k = 1..floor(log n/log p)}, a(1) = 1.

Terms

a(0) =1a(1) =2a(2) =3a(3) =8a(4) =5a(5) =24a(6) =7a(7) =64a(8) =27a(9) =320a(10) =11a(11) =1728a(12) =13a(13) =448a(14) =135a(15) =1024a(16) =17a(17) =27648a(18) =19a(19) =5120a(20) =189a(21) =11264a(22) =23a(23) =27648a(24) =125a(25) =13312a(26) =729a(27) =7168a(28) =29a(29) =93312000