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A207311 Number of n X n 0..2 arrays avoiding the pattern z-2 z-1 z in any row, column or nw-to-se diagonal 0
3, 81, 15390, 21162579, 205235353935, 14121763303437256, 6886304943923084187412, 23820527297958550757568717516, 584573521981314585923770355820671056 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A207317

LINKS

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

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A207195 A207215 A207544 * A206693 A223570 A228971

Adjacent sequences:  A207308 A207309 A207310 * A207312 A207313 A207314

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 16 2012

STATUS

approved

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Last modified January 25 11:23 EST 2022. Contains 350567 sequences. (Running on oeis4.)