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

A203835

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

Terms

    a(0) =45a(1) =225a(2) =225a(3) =1125a(4) =1971a(5) =1125a(6) =5625a(7) =17289a(8) =17289a(9) =5625a(10) =28125a(11) =151659a(12) =270333a(13) =151659a(14) =28125a(15) =140625a(16) =1330353a(17) =4238721a(18) =4238721a(19) =1330353a(20) =140625a(21) =703125a(22) =11669859a(23) =66490965a(24) =119606211a(25) =66490965a(26) =11669859a(27) =703125a(28) =3515625a(29) =102368025

External references