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

A203829

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

Terms

    a(0) =225a(1) =1971a(2) =17289a(3) =151659a(4) =1330353a(5) =11669859a(6) =102368025a(7) =897972507a(8) =7877016513a(9) =69097203603a(10) =606120799401

External references