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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A240656

LINKS

Table of n, a(n) for n=1..10.

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: A136553 A266293 A224323 * A011804 A292467 A291622

Adjacent sequences:  A240647 A240648 A240649 * A240651 A240652 A240653

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 09 2014

STATUS

approved

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Last modified September 19 05:33 EDT 2020. Contains 337176 sequences. (Running on oeis4.)