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A206951 Number of n X n 0..2 arrays avoiding the pattern z z+1 z in any row, column or nw-to-se diagonal 0
3, 81, 11804, 9803278, 50967712088, 1627105474024831, 314368117565737962789, 368862218847158027158758198 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A206957

LINKS

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

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A223969 A207202 A206856 * A206726 A207352 A207983

Adjacent sequences: A206948 A206949 A206950 * A206952 A206953 A206954

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 13 2012

STATUS

approved

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Last modified December 9 00:20 EST 2022. Contains 358698 sequences. (Running on oeis4.)