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A223459 6X6X6 triangular graph without horizontal edges coloring a rectangular array: number of n X n 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 0
21, 400, 47100, 31075684, 116111266332, 2412122721426324, 280173531066504459408, 180359138791051357960964956, 646396187061902362932292802186560 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A223467

LINKS

Table of n, a(n) for n=1..9.

EXAMPLE

Some solutions for n=3

..6.11..6....8.13..8....7.12..7....7..4..1...12.18.12....1..0..2...14.19.13

.11..7.11...13..8..5....4..8..4....4..1..4...17.12..7....0..2..0....9.14..9

..6.11..6....8.13..9....8..5..2....1..3..7...11.17.11....1..0..1...13..9.13

CROSSREFS

Sequence in context: A015677 A285396 A113363 * A240655 A014903 A219308

Adjacent sequences:  A223456 A223457 A223458 * A223460 A223461 A223462

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 20 2013

STATUS

approved

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Last modified September 21 16:31 EDT 2021. Contains 347598 sequences. (Running on oeis4.)