Product of the radicals of the integers less than n and relatively prime to n.

Terms

a(0) =1a(1) =1a(2) =2a(3) =3a(4) =12a(5) =5a(6) =360a(7) =105a(8) =280a(9) =63a(10) =151200a(11) =385a(12) =9979200a(13) =6435a(14) =112112a(15) =675675a(16) =54486432000a(17) =85085a(19) =2909907a(20) =369512000a(21) =416645775a(23) =37182145a(25) =40542838875a(27) =10756263375