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A297304 Number of 7Xn 0..1 arrays with every 1 horizontally or antidiagonally adjacent to 2 neighboring 1s. 1
1, 1, 21, 69, 266, 1574, 13504, 93906, 551477, 3159693, 18792129, 113862870, 692747205, 4226551294, 25828653795, 157805371000, 963306137176, 5876339680839, 35834865220658, 218515617055715, 1332575380148292 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Row 7 of A297299.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

EXAMPLE

Some solutions for n=5

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

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

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

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

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

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

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

CROSSREFS

Cf. A297299.

Sequence in context: A224072 A020150 A178389 * A155492 A201066 A200931

Adjacent sequences:  A297301 A297302 A297303 * A297305 A297306 A297307

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 27 2017

STATUS

approved

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Last modified July 24 06:04 EDT 2021. Contains 346273 sequences. (Running on oeis4.)