Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row and column sum not equal to 0 2 3 6 or 7 and every 3X3 diagonal and antidiagonal sum equal to 0 2 3 6 or 7.
A252256
Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row and column sum not equal to 0 2 3 6 or 7 and every 3X3 diagonal and antidiagonal sum equal to 0 2 3 6 or 7.
Terms
- a(0) =1072a(1) =1016a(2) =596a(3) =1316a(4) =3530a(5) =9836a(6) =33218a(7) =252162a(8) =1017410a(9) =4251650a(10) =95453186a(11) =461119490a(12) =2176843778a(13) =165104582658a(14) =884163477506
External references
- oeis: A252256