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A207215 Number of n X n 0..2 arrays avoiding the pattern z z+1 z in any row or column 0
3, 81, 12534, 12584703, 86510224720, 4019515127529418, 1256433426475190769775, 2643803004141585682944365943 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A207221

LINKS

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

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A207352 A207983 A207195 * A355071 A207544 A207311

Adjacent sequences: A207212 A207213 A207214 * A207216 A207217 A207218

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 16 2012

STATUS

approved

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Last modified January 30 09:51 EST 2023. Contains 359943 sequences. (Running on oeis4.)