Records in A304480.

Terms

a(0) =1a(1) =3a(2) =25a(3) =241a(4) =505a(5) =65521a(6) =131041a(7) =171865a(8) =138181681a(9) =6814407601a(10) =20174525281a(11) =45185409361a(12) =558781423201a(13) =685933859521