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

A203378

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

Terms

    a(0) =12a(1) =36a(2) =36a(3) =108a(4) =164a(5) =108a(6) =324a(7) =748a(8) =748a(9) =324a(10) =972a(11) =3412a(12) =5208a(13) =3412a(14) =972a(15) =2916a(16) =15564a(17) =36300a(18) =36300a(19) =15564a(20) =2916a(21) =8748a(22) =70996a(23) =253068a(24) =387324a(25) =253068a(26) =70996a(27) =8748a(28) =26244a(29) =323852

External references