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A206693 Number of n X n 0..2 arrays avoiding the pattern z-2 z-1 z in any row or column 1
3, 81, 15712, 23335217, 262482902920, 22540704363210913, 14777630573426014735558, 74010398585294927963749126971, 2831737193779046594636895038867701496 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A206700

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..10

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A207215 A207544 A207311 * A223570 A228971 A060722

Adjacent sequences:  A206690 A206691 A206692 * A206694 A206695 A206696

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 11 2012

STATUS

approved

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Last modified January 23 09:27 EST 2022. Contains 350510 sequences. (Running on oeis4.)