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A297437 Number of 7Xn 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 2 neighboring 1s. 1
1, 13, 320, 1085, 5108, 50127, 431723, 2741816, 19713343, 158831909, 1226649472, 9140274733, 69805274732, 540678554646, 4154873500103, 31813469310773, 244579087519367, 1883206579435015, 14482216168483555, 111339711139069346 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 7 of A297431.

LINKS

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

EXAMPLE

Some solutions for n=5

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

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

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

..0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0

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

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

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

CROSSREFS

Cf. A297431.

Sequence in context: A052114 A305143 A132485 * A166743 A212733 A183803

Adjacent sequences:  A297434 A297435 A297436 * A297438 A297439 A297440

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 30 2017

STATUS

approved

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Last modified July 29 11:53 EDT 2021. Contains 346346 sequences. (Running on oeis4.)