Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 0 2 3 6 or 7 and every 3X3 column and antidiagonal sum not equal to 0 2 3 6 or 7.
A252524
Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 0 2 3 6 or 7 and every 3X3 column and antidiagonal sum not equal to 0 2 3 6 or 7.
Terms
- a(0) =750a(1) =337a(2) =466a(3) =790a(4) =4420a(5) =13184a(6) =25280a(7) =433664a(8) =1580032a(9) =3235840a(10) =191758336a(11) =781844480a(12) =1656750080a(13) =363528716288
External references
- oeis: A252524