Number of 9 X 9 arrays of squares of integers, symmetric under 90-degree rotation, with all rows summing to n.

A156401

Number of 9 X 9 arrays of squares of integers, symmetric under 90-degree rotation, with all rows summing to n.

Terms

    a(0) =1a(1) =12a(2) =0a(3) =0a(4) =2334a(5) =2400a(6) =0a(7) =0a(8) =10236a(9) =6871a(10) =0a(11) =0a(12) =19368a(13) =51672a(14) =0a(15) =0a(16) =78762a(17) =62322a(18) =0a(19) =0a(20) =352350a(21) =244572a(22) =0a(23) =0a(24) =568284a(25) =268092a(26) =0a(27) =0a(28) =590400a(29) =1134048

External references