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A296314
Number of n X n 0..1 arrays with each 1 horizontally, vertically or antidiagonally adjacent to 1 neighboring 1.
1
1, 6, 32, 434, 12547, 676269, 78105580, 18043360170, 8435284786616, 8062065704707386, 15602483060688719807, 61357587200669343827967, 490367520450812937863879738, 7957358933563948031830555664333
OFFSET
1,2
COMMENTS
Diagonal of A296320.
LINKS
EXAMPLE
Some solutions for n=5
..1..1..0..1..0. .1..0..0..0..0. .0..0..0..0..0. .0..0..0..1..0
..0..0..0..1..0. .1..0..0..1..1. .1..0..0..1..0. .0..0..1..0..1
..0..0..0..0..0. .0..0..0..0..0. .1..0..1..0..0. .0..0..0..1..0
..1..0..1..1..0. .1..0..1..1..0. .0..0..0..1..0. .1..0..0..0..1
..1..0..0..0..0. .1..0..0..0..0. .1..1..0..1..0. .1..0..0..1..0
CROSSREFS
Cf. A296320.
Sequence in context: A368287 A276351 A135538 * A222605 A290790 A222749
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 10 2017
STATUS
approved