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A297538
Number of n X n 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 2 or 3 neighboring 1's.
0
1, 2, 35, 275, 12161, 3015179, 1610981344, 1479214192234, 4028895802966726, 43695679891258322395
OFFSET
1,2
COMMENTS
Diagonal of A297544.
EXAMPLE
Some solutions for n=5
..0..0..0..0..0. .1..1..0..1..1. .0..0..0..1..1. .0..1..1..0..0
..0..0..0..1..0. .1..1..0..1..1. .1..1..0..1..1. .1..1..0..1..1
..0..0..1..1..1. .1..1..0..1..0. .1..1..0..0..0. .0..0..0..1..1
..1..1..0..0..0. .1..0..0..1..1. .0..0..0..1..0. .1..1..0..0..1
..0..1..1..0..0. .0..1..1..1..1. .0..0..1..1..1. .1..1..1..1..0
CROSSREFS
Cf. A297544.
Sequence in context: A282727 A042353 A193576 * A089660 A058089 A055519
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 31 2017
STATUS
approved