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A207473 Number of n X n 0..3 arrays avoiding the patterns z z+1 z or z z-1 z in any row, column or nw-se diagonal 0
4, 256, 133556, 768149650, 45141978255552, 27133109124370438420 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A207479

LINKS

Table of n, a(n) for n=1..6.

EXAMPLE

Some solutions for n=4

..1..3..2..1....3..1..1..2....3..2..0..0....2..0..1..1....0..1..1..3

..1..2..2..1....0..1..1..0....1..1..1..1....2..0..1..2....2..2..1..3

..0..2..0..0....0..0..3..0....2..1..3..3....1..3..0..2....1..2..3..3

..0..0..2..2....1..2..2..0....0..1..2..0....1..3..3..2....0..3..3..0

CROSSREFS

Sequence in context: A326556 A223795 A207275 * A223658 A207529 A206968

Adjacent sequences:  A207470 A207471 A207472 * A207474 A207475 A207476

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 18 2012

STATUS

approved

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Last modified May 16 11:14 EDT 2022. Contains 353704 sequences. (Running on oeis4.)