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A206789 Number of n X n 0..3 arrays avoiding the pattern z z+1 z in any row, column, diagonal or antidiagonal. 0
4, 256, 180446, 1382766472, 120305843593958, 118056098980249594900 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A206797.

LINKS

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

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Cf. A206797.

Sequence in context: A223658 A207529 A206968 * A206961 A206569 A207576

Adjacent sequences:  A206786 A206787 A206788 * A206790 A206791 A206792

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 12 2012

STATUS

approved

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Last modified May 16 20:11 EDT 2022. Contains 353720 sequences. (Running on oeis4.)