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 0 1 2 7 8 or 9.

A252590

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 0 1 2 7 8 or 9.

Terms

    a(0) =13170a(1) =139918a(2) =139918a(3) =1741670a(4) =2932278a(5) =1741670a(6) =22094800a(7) =78789896a(8) =78789896a(9) =22094800a(10) =278456362a(11) =2038097660a(12) =4406719658a(13) =2038097660a(14) =278456362a(15) =3517561890a(16) =52624335712a(17) =235079475068a(18) =235079475068a(19) =52624335712a(20) =3517561890

External references