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A183329 Number of n X n binary arrays with each 1 adjacent to exactly two 0's. 0
1, 7, 26, 247, 4643, 135578, 7279940, 684911503, 111613234643, 31882671447699, 15903381470791210, 13849831552030467450, 21073883712902398984415 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A183335.

LINKS

Table of n, a(n) for n=1..13.

EXAMPLE

Some solutions for 6 X 6

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

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

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

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

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

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

CROSSREFS

Sequence in context: A197053 A009375 A009380 * A342930 A166406 A243006

Adjacent sequences:  A183326 A183327 A183328 * A183330 A183331 A183332

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 03 2011

STATUS

approved

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Last modified May 16 08:07 EDT 2022. Contains 353695 sequences. (Running on oeis4.)