Number of nX4 0..3 arrays x(i,j) with each element horizontally or vertically next to at least one element with value (x(i,j)+1) mod 4, and upper left element zero.

A230247

Number of nX4 0..3 arrays x(i,j) with each element horizontally or vertically next to at least one element with value (x(i,j)+1) mod 4, and upper left element zero.

Terms

    a(0) =0a(1) =26a(2) =514a(3) =18218a(4) =517794a(5) =15075834a(6) =442507578a(7) =12967930114a(8) =379758106610

External references