6 X 6 X 6 triangular graph coloring a rectangular array: number of n X 4 0..20 arrays where 0..20 label nodes of the fully triangulated graph and every array movement to a horizontal or vertical neighbor moves along an edge of this graph.

A223366

6 X 6 X 6 triangular graph coloring a rectangular array: number of n X 4 0..20 arrays where 0..20 label nodes of the fully triangulated graph and every array movement to a horizontal or vertical neighbor moves along an edge of this graph.