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A297295 Number of nXn 0..1 arrays with every 1 horizontally or antidiagonally adjacent to 2 neighboring 1s. 1
1, 1, 3, 10, 49, 495, 13504, 629563, 40753529, 4162842319, 790491998237, 268041967942170, 155466640607601204, 159960976273554094907, 300474954115694463716874, 1003924486221768324971576564 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Diagonal of A297299.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..21

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A297299.

Sequence in context: A082426 A054381 A102088 * A088142 A276028 A209902

Adjacent sequences:  A297292 A297293 A297294 * A297296 A297297 A297298

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 27 2017

STATUS

approved

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Last modified March 21 22:19 EDT 2019. Contains 321382 sequences. (Running on oeis4.)