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A240630
Number of n X n 0..1 arrays with no element equal to exactly three horizontal or vertical neighbors, with new values 0..1 introduced in row major order
0
1, 8, 129, 4989, 470170, 109584463, 63213422873, 90394294712339, 320691260884992280, 2823496298905253740496
OFFSET
1,2
COMMENTS
Diagonal of A240636
EXAMPLE
Some solutions for n=4
..0..1..0..0....0..1..1..1....0..1..0..1....0..0..1..1....0..1..0..1
..0..1..0..1....1..1..0..0....0..1..0..0....1..1..0..1....0..0..0..0
..0..1..1..0....0..0..1..1....1..0..1..1....0..0..0..0....1..1..0..0
..1..0..1..1....1..0..1..1....1..1..1..0....1..1..0..0....0..1..1..1
CROSSREFS
Sequence in context: A073701 A239756 A295240 * A187609 A365058 A241076
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 09 2014
STATUS
approved