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A206726 Number of n X n 0..2 arrays avoiding the pattern z-1 z-1 z in any row, column or nw-to-se diagonal 0
3, 81, 11804, 9974630, 48956655199, 1435005981948541, 253106740389132162761 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A206734

LINKS

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

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A207202 A206856 A206951 * A207352 A207983 A207195

Adjacent sequences: A206723 A206724 A206725 * A206727 A206728 A206729

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 11 2012

STATUS

approved

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Last modified January 28 08:20 EST 2023. Contains 359850 sequences. (Running on oeis4.)