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A232916 Number of n X n 0..2 arrays with no element x(i,j) adjacent to value 2-x(i,j) horizontally, diagonally or antidiagonally 1
3, 18, 246, 5808, 316800, 33994188, 8119777890, 3947661560964, 4209693243140760, 9272914213858594488, 44451105435218301006576, 443715189648501201190713852, 9592990624095118315413686008902, 434027944128749167232792242832245920 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A232920

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..16

EXAMPLE

Some solutions for n=4

..2..2..2..2....1..0..1..2....2..2..2..2....2..2..2..1....2..2..2..2

..2..2..1..2....1..0..1..2....2..1..2..1....2..2..2..2....2..1..2..1

..1..2..1..2....1..0..1..2....2..2..2..1....1..2..1..2....2..1..2..2

..1..2..2..2....1..2..1..0....1..2..2..1....1..0..1..2....2..1..2..2

CROSSREFS

Sequence in context: A137223 A159640 A038061 * A327231 A279490 A299431

Adjacent sequences:  A232913 A232914 A232915 * A232917 A232918 A232919

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 02 2013

STATUS

approved

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Last modified January 29 11:16 EST 2020. Contains 331337 sequences. (Running on oeis4.)