T(n,k)=Number of (n+2)X(k+2) 0..3 arrays with no row, column, diagonal or antidiagonal in any 3X3 subblock summing to 4 or more.

A251858

T(n,k)=Number of (n+2)X(k+2) 0..3 arrays with no row, column, diagonal or antidiagonal in any 3X3 subblock summing to 4 or more.

Terms

    a(0) =2506a(1) =23664a(2) =23664a(3) =245388a(4) =459952a(5) =245388a(6) =2525037a(7) =10413561a(8) =10413561a(9) =2525037a(10) =25675786a(11) =216245728a(12) =486474024a(13) =216245728a(14) =25675786a(15) =261035198a(16) =4504504613a(17) =20861600041a(18) =20861600041a(19) =4504504613a(20) =261035198a(21) =2662774377a(22) =95484824630

External references