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A296581
Number of n X n 0..1 arrays with each 1 horizontally, vertically or antidiagonally adjacent to 0, 2 or 3 neighboring 1's.
0
2, 9, 83, 2458, 214830, 52756072, 39585589653, 84537581697810, 511595224386235896, 8854271989464391363762, 434511224471903201800210223
OFFSET
1,1
COMMENTS
Diagonal of A296588.
EXAMPLE
Some solutions for n=4
..1..0..0..1. .1..1..0..1. .0..0..1..1. .1..0..0..0. .1..1..0..1
..0..0..0..0. .1..0..1..1. .0..0..1..0. .0..1..0..0. .1..0..1..1
..0..1..0..1. .0..0..0..0. .0..0..0..0. .1..1..0..1. .1..0..0..1
..1..1..0..0. .1..0..0..1. .0..1..0..0. .0..0..0..0. .1..1..1..1
CROSSREFS
Cf. A296588.
Sequence in context: A323769 A375838 A354045 * A069234 A086929 A193466
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 16 2017
STATUS
approved