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A297648 Number of nXn 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 1, 2 or 3 neighboring 1s. 0
1, 10, 231, 11024, 2525244, 1906300826, 3863740405975, 26223048303944542, 618905182069042142432, 45235515405863464673598537 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A297654.

LINKS

Table of n, a(n) for n=1..10.

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Cf. A297654.

Sequence in context: A239772 A239773 A087434 * A012240 A295410 A188679

Adjacent sequences:  A297645 A297646 A297647 * A297649 A297650 A297651

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 02 2018

STATUS

approved

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Last modified October 20 12:47 EDT 2019. Contains 328257 sequences. (Running on oeis4.)