login
A223341
5X5X5 triangular graph coloring a rectangular array: number of nX5 0..14 arrays where 0..14 label nodes of a graph with edges 0,1 0,2 1,2 1,3 1,4 2,4 3,4 2,5 4,5 3,6 3,7 4,7 6,7 4,8 5,8 7,8 5,9 8,9 6,10 6,11 7,11 10,11 7,12 8,12 11,12 11,12 8,13 9,13 12,13 9,14 13,14 and every array movement to a horizontal or vertical neighbor moves along an edge of this graph
1
5280, 840456, 161370036, 32292951660, 6584672294340, 1348575549617448, 277054255741556856, 56940259467203183256, 11710070305971166272660, 2408151234905842137832152, 495314429698860436138291212
OFFSET
1,1
COMMENTS
Column 5 of A223344
LINKS
EXAMPLE
Some solutions for n=3
..3..7..8..5..4....3..7.12..7..6....3..7..3..4..1....3..4..7..6.11
..7..8..5..9..5....7..8..7.12..7....7..3..4..3..4....7..8..4..7..6
..3..4..2..5..4....3..4..3..7.12....3..4..3..4..3....3..4..5..4..7
CROSSREFS
Sequence in context: A223494 A265985 A234994 * A270798 A237002 A178027
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 19 2013
STATUS
approved