6 X 6 X 6 triangular graph coloring a rectangular array: number of n X 1 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.
A223363
6 X 6 X 6 triangular graph coloring a rectangular array: number of n X 1 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.
Terms
- a(0) =21a(1) =90a(2) =420a(3) =1992a(4) =9552a(5) =45984a(6) =221760a(7) =1070208a(8) =5166336a(9) =24943104a(10) =120431616a(11) =581486592a(12) =2807648256a(13) =13556490240a(14) =65456455680a(15) =316051587072
External references
- oeis: A223363