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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
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
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 03 2011
STATUS
approved

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Last modified June 24 09:30 EDT 2024. Contains 373674 sequences. (Running on oeis4.)