Product of squares of proper divisors of n.

Terms

a(0) =1a(1) =1a(2) =1a(3) =4a(4) =1a(5) =36a(6) =1a(7) =64a(8) =9a(9) =100a(10) =1a(11) =20736a(12) =1a(13) =196a(14) =225a(15) =4096a(16) =1a(17) =104976a(18) =1a(19) =160000a(20) =441a(21) =484a(22) =1a(23) =191102976a(24) =25a(25) =676a(26) =729a(27) =614656a(28) =1a(29) =729000000