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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

R. H. Hardin, Table of n, a(n) for n = 1..19

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: A232338 A252937 A033277 * A190602 A134386 A200875

Adjacent sequences:  A190530 A190531 A190532 * A190534 A190535 A190536

KEYWORD

nonn

AUTHOR

R. H. Hardin May 12 2011

STATUS

approved

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Last modified May 16 02:09 EDT 2022. Contains 353687 sequences. (Running on oeis4.)