Number of n X 2 0..4 arrays with every 2 X 2 subblock containing exactly one value repeat, and new values 0..4 introduced in row major order.

A209497

Number of n X 2 0..4 arrays with every 2 X 2 subblock containing exactly one value repeat, and new values 0..4 introduced in row major order.

Terms

    a(0) =2a(1) =6a(2) =57a(3) =690a(4) =9393a(5) =133380a(6) =1920126a(7) =27760512a(8) =401882796a(9) =5820335088a(10) =84304518360

External references