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A190533 Number of (n+2)X(n+2) symmetric binary matrices without the pattern 0 1 1 vertically or horizontally 1
42, 332, 3660, 59408, 1405148, 49455712, 2586803564, 202549927174, 23737296725976, 4174330956088592, 1101527208080551428, 436589349514722980996, 259916332325245438667936 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
EXAMPLE
Some solutions for 4X4
..0..0..0..1....0..0..1..0....1..1..0..0....0..0..0..0....0..1..0..1
..0..0..0..1....0..0..1..0....1..0..0..0....0..1..0..1....1..1..0..0
..0..0..0..1....1..1..0..0....0..0..0..1....0..0..0..0....0..0..0..0
..1..1..1..0....0..0..0..1....0..0..1..0....0..1..0..1....1..0..0..1
CROSSREFS
Sequence in context: A252937 A033277 A362103 * A190602 A134386 A200875
KEYWORD
nonn
AUTHOR
R. H. Hardin May 12 2011
STATUS
approved

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Last modified April 20 12:36 EDT 2024. Contains 371844 sequences. (Running on oeis4.)