Number of (n+1) X 3 0..5 arrays with every 2 X 2 subblock having equal diagonal elements or equal antidiagonal elements.

A203928

Number of (n+1) X 3 0..5 arrays with every 2 X 2 subblock having equal diagonal elements or equal antidiagonal elements.

Terms

    a(0) =4356a(1) =106596a(2) =2543436a(3) =60873876a(4) =1456391916a(5) =34845401556a(6) =833700866796

External references