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A297295
Number of n X n 0..1 arrays with every 1 horizontally or antidiagonally adjacent to 2 neighboring 1's.
1
1, 1, 3, 10, 49, 495, 13504, 629563, 40753529, 4162842319, 790491998237, 268041967942170, 155466640607601204, 159960976273554094907, 300474954115694463716874, 1003924486221768324971576564
OFFSET
1,3
COMMENTS
Diagonal of A297299.
LINKS
EXAMPLE
Some solutions for n=5
..0..0..1..1..0. .0..0..0..0..0. .0..0..0..1..1. .0..1..1..0..0
..0..1..1..0..0. .0..0..0..0..0. .0..0..1..1..0. .1..1..0..0..0
..0..0..0..0..0. .0..1..1..0..0. .0..0..0..0..0. .0..1..1..0..0
..0..0..1..1..0. .1..1..0..1..1. .0..0..0..0..0. .1..1..0..1..1
..0..1..1..0..0. .0..0..1..1..0. .0..0..0..0..0. .0..0..1..1..0
CROSSREFS
Cf. A297299.
Sequence in context: A359459 A054381 A102088 * A088142 A276028 A209902
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 27 2017
STATUS
approved