login
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
OFFSET
1,1
LINKS
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: A033277 A362103 A190533 * A134386 A200875 A215628
KEYWORD
nonn
AUTHOR
R. H. Hardin May 13 2011
STATUS
approved