Number of 11 X 11 arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to n.

A156406

Number of 11 X 11 arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to n.

Terms

    a(0) =1a(1) =312a(2) =26820a(3) =424980a(4) =4108632a(5) =10491480a(6) =36058540a(7) =69492920a(8) =448032730a(9) =378230514a(10) =1435365144a(11) =3867308971a(12) =10607876660a(13) =16504055920a(14) =18737188768a(15) =31390349120a(16) =99812199364a(17) =71763897760a(18) =163052061000a(19) =338077231956

External references