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A207229 Number of n X n 0..2 arrays avoiding the patterns z z+1 z or z z-1 z in any row, column, diagonal or antidiagonal 0
3, 81, 5853, 2464241, 5437970705, 47274560618753, 1735838281998728881 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A207235

LINKS

Table of n, a(n) for n=1..7.

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A292974 A209587 A223736 * A223717 A223825 A207222

Adjacent sequences:  A207226 A207227 A207228 * A207230 A207231 A207232

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 16 2012

STATUS

approved

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Last modified September 18 07:26 EDT 2020. Contains 337166 sequences. (Running on oeis4.)