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A233255 Number of nX7 0..5 arrays with no element x(i,j) adjacent to itself or value 5-x(i,j) horizontally or antidiagonally, top left element zero, and 1 appearing before 2 3 and 4, and 2 appearing before 3 in row major order (unlabelled 6-colorings with no clashing color pairs) 1
528, 1992704, 8050180096, 32835998056448, 134179300927602688, 548491734506604068864, 2242238966451009797226496, 9166394920089108387649814528, 37472795110784044637628292661248 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 of A233256

LINKS

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

FORMULA

Empirical: a(n) = 5504*a(n-1) -6438912*a(n-2) +2774532096*a(n-3) -478351982592*a(n-4) +27831388078080*a(n-5)

EXAMPLE

Some solutions for n=2

..0..1..0..1..2..5..2....0..1..0..1..0..2..4....0..1..0..1..2..4..3

..5..1..3..5..3..4..3....2..4..0..3..1..3..5....3..4..0..4..3..0..2

CROSSREFS

Sequence in context: A263909 A233173 A233128 * A204684 A205160 A205309

Adjacent sequences:  A233252 A233253 A233254 * A233256 A233257 A233258

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 06 2013

STATUS

approved

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Last modified January 18 21:06 EST 2021. Contains 340262 sequences. (Running on oeis4.)