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A207275 Number of n X n 0..3 arrays avoiding the patterns z z+1 z or z z-1 z in any row, column, diagonal or antidiagonal 0
4, 256, 121014, 553738958, 23419301672964 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A207283

LINKS

Table of n, a(n) for n=1..5.

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A122249 A326556 A223795 * A207473 A223658 A207529

Adjacent sequences:  A207272 A207273 A207274 * A207276 A207277 A207278

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 16 2012

STATUS

approved

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Last modified September 27 21:12 EDT 2021. Contains 347698 sequences. (Running on oeis4.)