1/25 the number of (n+1)X6 0..4 arrays with every 2X2 subblock having equal diagonal elements or equal antidiagonal elements.

A203653

1/25 the number of (n+1)X6 0..4 arrays with every 2X2 subblock having equal diagonal elements or equal antidiagonal elements.

Terms

    a(0) =59049a(1) =9616161a(2) =1780968921a(3) =343812029649

External references