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A297727 Number of nXn 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 2 or 4 neighboring 1s. 0
1, 2, 17, 93, 2719, 65215, 6241242, 959915987, 322119198752, 199728169017008 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A297733.

LINKS

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

EXAMPLE

Some solutions for n=6

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

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

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

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

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

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

CROSSREFS

Cf. A297733.

Sequence in context: A320644 A081744 A219757 * A002645 A100268 A163790

Adjacent sequences:  A297724 A297725 A297726 * A297728 A297729 A297730

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 04 2018

STATUS

approved

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Last modified June 18 15:13 EDT 2019. Contains 324213 sequences. (Running on oeis4.)