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A206968 Number of n X n 0..3 arrays avoiding the pattern z-1 z-1 z in any row, column, nw-to-se diagonal or ne-to-sw antidiagonal 0
4, 256, 180294, 1391081032, 118749552817647 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A206974

LINKS

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

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A207473 A223658 A207529 * A206789 A206961 A206569

Adjacent sequences:  A206965 A206966 A206967 * A206969 A206970 A206971

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 14 2012

STATUS

approved

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Last modified September 27 22:36 EDT 2020. Contains 337388 sequences. (Running on oeis4.)