Number of 8 X 8 pandiagonal Franklin squares with magic sum 4n.

Terms

a(0) =1a(1) =32a(2) =417a(3) =3072a(4) =15585a(5) =60960a(6) =197057a(7) =550912a(8) =1374273a(9) =3127840a(10) =6602849a(11) =13089792a(12) =24605217a(13) =44188704a(14) =76283265a(15) =127213568a(16) =205777537a(17) =323968032a(18) =497842465a(19) =748559360a(20) =1103602017a(21) =1598210592a(22) =2277045057a(23) =3196102656