1/6 of the number of ways of 3-coloring an (n-2) X n grid.

A078102

1/6 of the number of ways of 3-coloring an (n-2) X n grid.

Terms

    a(0) =2a(1) =27a(2) =853a(3) =63267a(4) =11045757a(5) =4547477370

External references