Number of 13 X 13 arrays of squares of integers, symmetric about the diagonal and under 90-degree rotation, with all rows summing to n.
A156414
Number of 13 X 13 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) =820a(5) =0a(6) =0a(7) =0a(8) =3360a(9) =0a(10) =0a(11) =0a(12) =36432a(13) =13751a(14) =0a(15) =0a(16) =31360a(17) =0a(18) =0a(19) =0a(20) =195030a(21) =56610a(22) =0a(23) =0a(24) =267840a(25) =0a(26) =0a(27) =0a(28) =311160a(29) =591360
External references
- oeis: A156414