Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row and column sum not equal to 0 1 3 6 or 7 and every 3X3 diagonal and antidiagonal sum equal to 0 1 3 6 or 7.
A252149
Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row and column sum not equal to 0 1 3 6 or 7 and every 3X3 diagonal and antidiagonal sum equal to 0 1 3 6 or 7.
Terms
- a(0) =1254a(1) =1874a(2) =3197a(3) =8425a(4) =29276a(5) =112547a(6) =446661a(7) =1835764a(8) =7371828a(9) =29451572a(10) =157491348a(11) =667705844a(12) =2844547668a(13) =89546455828a(14) =470179496916
External references
- oeis: A252149