T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with every 2X2 subblock having equal diagonal elements or equal antidiagonal elements.

A203796

T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with every 2X2 subblock having equal diagonal elements or equal antidiagonal elements.

Terms

    a(0) =112a(1) =784a(2) =784a(3) =5488a(4) =10576a(5) =5488a(6) =38416a(7) =142192a(8) =142192a(9) =38416a(10) =268912a(11) =1911952a(12) =3784288a(13) =1911952a(14) =268912a(15) =1882384a(16) =25708528a(17) =101071600a(18) =101071600a(19) =25708528a(20) =1882384a(21) =13176688a(22) =345682576a(23) =2700695728a(24) =5426653360a(25) =2700695728a(26) =345682576

External references