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A240512 Number of n X n 0..1 arrays with no element equal to exactly two horizontal and vertical neighbors, with new values 0..1 introduced in row major order 0
1, 3, 10, 99, 1376, 37624, 1906245, 180760099, 31517059634, 10196460883584 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A240519

LINKS

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

EXAMPLE

Some solutions for n=4

..0..1..0..1....0..1..0..1....0..1..0..1....0..1..1..1....0..1..0..1

..1..0..1..0....0..1..1..0....1..1..1..0....0..0..1..0....1..1..0..0

..0..1..0..1....1..1..0..1....0..0..0..1....0..1..0..1....0..1..0..1

..1..0..1..0....0..1..0..1....1..0..1..0....1..0..1..0....1..0..1..0

CROSSREFS

Sequence in context: A005205 A216450 A181079 * A065924 A013233 A013226

Adjacent sequences:  A240509 A240510 A240511 * A240513 A240514 A240515

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 06 2014

STATUS

approved

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Last modified August 7 19:57 EDT 2020. Contains 336279 sequences. (Running on oeis4.)