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A303320 Number of nXn 0..1 arrays with every element equal to 0, 2, 4, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. 0
1, 2, 4, 2, 64, 56, 2956, 24759, 3531980, 122180446, 68902353881 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A303325.

LINKS

Table of n, a(n) for n=1..11.

EXAMPLE

Some solutions for n=5

..0..1..1..1..0. .0..0..0..0..0. .0..1..1..1..0. .0..0..0..0..0

..0..1..1..1..0. .1..0..1..0..1. .0..1..1..1..0. .1..0..1..0..1

..1..1..1..1..1. .0..0..0..0..0. .0..1..0..1..0. .1..0..1..0..1

..0..0..1..0..0. .1..1..1..1..1. .0..1..1..1..0. .1..0..1..0..1

..0..0..1..0..0. .0..1..0..1..0. .1..1..0..1..1. .0..0..0..0..0

CROSSREFS

Cf. A303325.

Sequence in context: A259685 A301460 A130172 * A029589 A121819 A134138

Adjacent sequences:  A303317 A303318 A303319 * A303321 A303322 A303323

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 21 2018

STATUS

approved

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Last modified July 12 15:09 EDT 2020. Contains 335665 sequences. (Running on oeis4.)