Number of 15 X 15 arrays of squares of integers, symmetric about the diagonal and under 90-degree rotation, with all rows summing to n.
A156419
Number of 15 X 15 arrays of squares of integers, symmetric about the diagonal and under 90-degree rotation, with all rows summing to n.
Terms
- a(0) =1a(1) =0a(2) =0a(3) =0a(4) =6912a(5) =0a(6) =0a(7) =0a(8) =146160a(9) =0a(10) =0a(11) =0a(12) =1414567a(13) =0a(14) =0a(15) =804511a(16) =5450892a(17) =0a(18) =0a(19) =0a(20) =27519912a(21) =0a(22) =0a(23) =5291400a(24) =57290800a(25) =0a(26) =0a(27) =0a(28) =122542980a(29) =0
External references
- oeis: A156419