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A207222 Number of n X n 0..2 arrays avoiding the patterns z z+1 z or z z-1 z in any row, column or nw-se diagonal 0
3, 81, 6819, 3447649, 8779228417, 105855104360481, 6152504033864688529, 1755834487701036618450529 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A207228

LINKS

Table of n, a(n) for n=1..8.

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A207229 A223717 A223825 * A207007 A223783 A223969

Adjacent sequences:  A207219 A207220 A207221 * A207223 A207224 A207225

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 16 2012

STATUS

approved

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Last modified August 10 04:38 EDT 2020. Contains 336368 sequences. (Running on oeis4.)