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A203279 Number of n X n binary arrays with every element neighboring horizontally or vertically both a 0 and a 1 1
0, 4, 28, 676, 72852, 26193924, 31747280900, 124891129720900, 1596519898829489564, 66137923505214401888644, 8881717991453403420376233852, 3865789910670398372168483012783044 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Diagonal of A203285
LINKS
EXAMPLE
Some solutions for n=4
..1..1..0..1....1..0..1..0....1..0..1..1....1..0..1..1....0..0..1..0
..0..1..0..1....1..0..1..0....1..0..1..0....1..0..1..0....1..0..1..0
..0..0..0..1....0..1..0..0....1..1..0..0....0..0..0..0....1..0..1..1
..1..1..0..1....0..1..1..1....0..0..1..1....1..1..1..1....1..0..0..1
CROSSREFS
Sequence in context: A091969 A101346 A120604 * A081792 A336622 A354842
KEYWORD
nonn
AUTHOR
R. H. Hardin Dec 31 2011
STATUS
approved

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Last modified July 22 12:22 EDT 2024. Contains 374499 sequences. (Running on oeis4.)