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A281073 Number of nXn 0..1 arrays with no element equal to more than two of its horizontal, vertical and antidiagonal neighbors, with the exception of exactly one element, and with new values introduced in order 0 sequentially upwards. 0
0, 0, 55, 958, 10954, 89042, 566178, 3035844, 14551996, 65113158, 280515214, 1187820788, 5004343732 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Diagonal of A281080.

LINKS

Table of n, a(n) for n=1..13.

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Cf. A281080.

Sequence in context: A221786 A241634 A008402 * A203872 A297753 A134291

Adjacent sequences:  A281070 A281071 A281072 * A281074 A281075 A281076

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 14 2017

STATUS

approved

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Last modified November 12 04:21 EST 2019. Contains 329051 sequences. (Running on oeis4.)