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A283685 Number of nXn 0..1 arrays with no 1 equal to more than two of its horizontal, diagonal and antidiagonal neighbors. 0
2, 16, 264, 15226, 2530461, 1119189256, 1496646288297, 5725555721739395, 62058786307229208212, 1952915013418224842868823, 176329484983538571638638096503 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A283691.

LINKS

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

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Cf. A283691.

Sequence in context: A090305 A246739 A304317 * A197458 A050974 A012188

Adjacent sequences:  A283682 A283683 A283684 * A283686 A283687 A283688

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 14 2017

STATUS

approved

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Last modified November 13 19:25 EST 2018. Contains 317149 sequences. (Running on oeis4.)