a(n) = n * pod(n) where pod(n) = the product of divisors of n (A007955).

Terms

a(0) =1a(1) =4a(2) =9a(3) =32a(4) =25a(5) =216a(6) =49a(7) =512a(8) =243a(9) =1000a(10) =121a(11) =20736a(12) =169a(13) =2744a(14) =3375a(15) =16384a(16) =289a(17) =104976a(18) =361a(19) =160000a(20) =9261a(21) =10648a(22) =529a(23) =7962624a(24) =3125a(25) =17576a(26) =19683a(27) =614656a(28) =841a(29) =24300000