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A297727
Number of n X n 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 2 or 4 neighboring 1's.
0
1, 2, 17, 93, 2719, 65215, 6241242, 959915987, 322119198752, 199728169017008
OFFSET
1,2
COMMENTS
Diagonal of A297733.
EXAMPLE
Some solutions for n=6
..0..0..1..1..1..0. .0..0..1..0..1..0. .1..1..0..1..1..1. .0..1..1..0..0..0
..1..1..0..0..0..1. .0..1..1..1..0..1. .1..1..0..0..1..0. .1..0..0..1..1..1
..1..1..1..0..1..1. .0..0..0..0..1..0. .0..0..0..1..0..1. .0..1..1..0..1..0
..1..0..0..0..1..0. .1..1..0..1..0..1. .1..1..0..0..1..0. .1..1..1..1..0..1
..0..1..1..0..0..1. .1..1..0..0..1..1. .1..1..0..1..0..1. .1..0..0..1..1..1
..0..0..0..1..1..0. .0..0..0..0..1..1. .0..0..0..0..1..0. .0..1..1..0..1..0
CROSSREFS
Cf. A297733.
Sequence in context: A081744 A372189 A219757 * A358591 A002645 A100268
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 04 2018
STATUS
approved