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A283093 Number of nXn 0..1 arrays with no 1 equal to more than one of its horizontal and vertical neighbors, with the exception of exactly two elements. 0
0, 0, 72, 8536, 2231690, 1354321470, 2028744947006, 7685048253383394, 74968472049231105434, 1906199245553492643004970 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Diagonal of A283100.

LINKS

Table of n, a(n) for n=1..10.

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Cf. A283100.

Sequence in context: A223148 A289368 A119750 * A178635 A271189 A093272

Adjacent sequences:  A283090 A283091 A283092 * A283094 A283095 A283096

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 28 2017

STATUS

approved

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Last modified February 26 05:51 EST 2020. Contains 332277 sequences. (Running on oeis4.)