T(n,k)=Number of (n+2)X(k+2) 0..3 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum less than 6.

A252121

T(n,k)=Number of (n+2)X(k+2) 0..3 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum less than 6.

Terms

    a(0) =41092a(1) =1091710a(2) =1091710a(3) =30699048a(4) =83930022a(5) =30699048a(6) =845139814a(7) =6987308056a(8) =6987308056a(9) =845139814a(10) =23117206344a(11) =542424609174a(13) =542424609174a(14) =23117206344a(15) =633958684608

External references