a(n) = squarefree part of A145609(n).

Terms

a(0) =3a(1) =1a(2) =1a(3) =761a(4) =61a(5) =509a(6) =1171733a(7) =8431a(8) =39541a(9) =55835135a(10) =36093a(11) =1347822955a(12) =34395742267a(13) =375035183a(14) =9682292227a(17) =40030624861