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A296535 Number of nXn 0..1 arrays with each 1 horizontally, vertically or antidiagonally adjacent to 2 or 4 neighboring 1s. 0
1, 3, 16, 126, 2104, 78660, 5705431, 820373528, 239372827502, 141301759543525, 168080053760638246, 403684916425998696873 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A296541.

LINKS

Table of n, a(n) for n=1..12.

EXAMPLE

Some solutions for n=6

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

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

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

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

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

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

CROSSREFS

Cf. A296541.

Sequence in context: A247591 A188805 A214645 * A088358 A082161 A264636

Adjacent sequences:  A296532 A296533 A296534 * A296536 A296537 A296538

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 15 2017

STATUS

approved

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Last modified January 22 07:39 EST 2020. Contains 331139 sequences. (Running on oeis4.)