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A190602 Number of (n+2)X(n+2) symmetric binary matrices without the pattern 1 0 1 vertically or horizontally 1
42, 334, 4449, 97424, 3388130, 187160348, 16551136352, 2348378261899, 533921776093322, 194297764330364986, 113166821986252773490, 105535296084137818939844, 157606962038222415838019755 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..17

EXAMPLE

Some solutions for 4X4

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

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

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

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

CROSSREFS

Sequence in context: A252937 A033277 A190533 * A134386 A200875 A215628

Adjacent sequences:  A190599 A190600 A190601 * A190603 A190604 A190605

KEYWORD

nonn

AUTHOR

R. H. Hardin May 13 2011

STATUS

approved

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Last modified October 31 12:41 EDT 2020. Contains 338101 sequences. (Running on oeis4.)