A223604 Petersen graph (8,2) coloring a rectangular array: number of 6Xn 0..15 arrays where 0..15 label nodes of a graph with edges 0,1 0,8 8,14 8,10 1,2 1,9 9,15 9,11 2,3 2,10 10,12 3,4 3,11 11,13 4,5 4,12 12,14 5,6 5,13 13,15 6,7 6,14 7,0 7,15 and every array movement to a horizontal, diagonal or antidiagonal neighbor moves along an edge of this graph.

16777216, 217600, 21308000, 982848688, 77164934624, 5493636282928, 430525083804688, 33412125075233264, 2632417918238601216, 207242362758169075664, 16354092687858619453040, 1290529367734515426273264

Offset: 1

Author

R. H. Hardin Mar 23 2013

Keywords

• nonn

Comments

Row 6 of A223599

Examples

			Some solutions for n=3
..0..8..0....0..8..0....0..8..0....0..8..0....0..8..0....0..8..0....0..8..0
..0..1..0...10..8.10...10..8.14....0..1..0...10..8.10....0..8.14....0..1..0
..9..1..2...14..8.10...14..8..0....0..7..0...10..8.10...14..8.14....2..1..9
..2..1..9...10..8.10....0..8.10...15..7..6....0..8..0....0..8.14....0..1..0
..2..1..0....0..8..0...10..8.10...15..7.15....0..8.14...10..8.10....2..1..9
..2..1..2...14..8..0....0..8.10....6..7..0....0..8..0....0..8.10....0..1..9
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..127