1/3 the number of n X 6 0..2 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors.

A185556

1/3 the number of n X 6 0..2 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors.

Terms

    a(0) =11a(1) =2768a(2) =269496a(3) =30132444a(4) =3228500154a(5) =353403366772

External references