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A240650
Number of n X n 0..1 arrays with no element equal to exactly one horizontal or vertical neighbor, with new values 0..1 introduced in row major order
0
1, 2, 9, 91, 2456, 184819, 37066859, 18940533171, 24272278810439, 77660940030730106
OFFSET
1,2
COMMENTS
Diagonal of A240656
EXAMPLE
Some solutions for n=4
..0..0..0..0....0..0..0..1....0..0..1..1....0..1..0..0....0..0..0..1
..0..1..0..0....0..0..0..0....0..0..1..1....1..0..0..0....0..0..0..0
..0..0..1..0....0..1..0..0....0..0..0..0....0..0..1..0....0..0..0..0
..1..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0....1..0..0..0
CROSSREFS
Sequence in context: A266293 A368840 A224323 * A356566 A365363 A011804
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 09 2014
STATUS
approved