Number of 12 X 12 arrays of squares of integers, symmetric under 90-degree rotation, with all rows summing to n.
A156411
Number of 12 X 12 arrays of squares of integers, symmetric under 90-degree rotation, with all rows summing to n.
Terms
- a(0) =1a(1) =120a(2) =8940a(3) =216680a(4) =1939740a(5) =7574400a(6) =18391220a(7) =48340560a(8) =133072650a(9) =294400160a(10) =636803010a(11) =1521100320a(12) =3164432181a(13) =5269056120a(14) =9096418860a(15) =18579992000a(16) =34459271550a(17) =49721066400a(18) =70412760560a(19) =126260708400a(20) =215977376730
External references
- oeis: A156411