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A223463 6X6X6 triangular graph without horizontal edges coloring a rectangular array: number of nX4 0..20 arrays where 0..20 label nodes of a graph with edges 0,1 0,2 1,3 1,4 2,4 2,5 3,6 3,7 4,7 4,8 5,8 5,9 6,10 6,11 7,11 7,12 8,12 8,13 9,13 9,14 10,15 10,16 11,16 11,17 12,17 12,18 13,18 13,19 14,19 14,20 and every array movement to a horizontal or vertical neighbor moves along an edge of this graph 1
600, 20588, 789796, 31075684, 1239353252, 49754342824, 2005957755820, 81082814719516, 3283105035003140, 133083400954907428, 5398712599231655976, 219116134683255389256, 8896250767631907738132, 361277018676277740943780 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A223467

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

EXAMPLE

Some solutions for n=3

..1..4..2..5....1..4..7.11....1..0..2..0...10..6.11..7....1..4..7..3

..3..7..4..8....4..7.12..7....0..1..4..2....6..3..7..4....3..7..3..1

..1..4..8..4....7..3..7..4....2..0..2..5...11..7.11..7....7.12..7..3

CROSSREFS

Sequence in context: A157918 A092183 A048530 * A023915 A035850 A093260

Adjacent sequences:  A223460 A223461 A223462 * A223464 A223465 A223466

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 20 2013

STATUS

approved

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Last modified March 25 04:30 EDT 2019. Contains 321457 sequences. (Running on oeis4.)