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

1,2

COMMENTS

Diagonal of A240636

LINKS

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

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 A241076 A349683

Adjacent sequences:  A240627 A240628 A240629 * A240631 A240632 A240633

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 09 2014

STATUS

approved

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Last modified May 16 15:56 EDT 2022. Contains 353706 sequences. (Running on oeis4.)