Number of 9 X 9 arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to n.

A156399

Number of 9 X 9 arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to n.

Terms

    a(0) =1a(1) =76a(2) =1728a(3) =9712a(4) =34814a(5) =40416a(6) =130456a(7) =149480a(8) =644220a(9) =297215a(10) =1380432a(11) =3924896a(12) =4260776a(13) =4171320a(14) =5913728a(15) =6328576a(16) =17481322a(17) =7436362a(18) =23029656a(19) =61580624a(20) =75335814a(21) =56271108a(22) =62202832a(23) =54904272a(24) =183254724a(25) =62428100a(26) =176105168

External references