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A297389 Number of n X n 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 1 neighboring 1. 0
1, 5, 19, 126, 3175, 99682, 4279111, 540319235, 108762242579, 33338094951563, 23051383345794169, 28507330662583210289, 58989477569892970363690, 240856095225813296736743615 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A297395.

LINKS

Table of n, a(n) for n=1..14.

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A297395.

Sequence in context: A339079 A209111 A328060 * A228479 A187018 A193287

Adjacent sequences:  A297386 A297387 A297388 * A297390 A297391 A297392

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 29 2017

STATUS

approved

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Last modified August 5 07:21 EDT 2021. Contains 346464 sequences. (Running on oeis4.)