1/729 the number of (n+2) X 3 0..2 arrays with no 3 X 3 subblock trace equal to any horizontal or vertical neighbor 3 X 3 subblock trace.

A185883

1/729 the number of (n+2) X 3 0..2 arrays with no 3 X 3 subblock trace equal to any horizontal or vertical neighbor 3 X 3 subblock trace.

Terms

    a(0) =27a(1) =588a(2) =12900a(3) =282672a(4) =6195480a(5) =135783240a(6) =2975926392a(7) =65222436072

External references