A190602 Number of (n+2)X(n+2) symmetric binary matrices without the pattern 1 0 1 vertically or horizontally

42, 334, 4449, 97424, 3388130, 187160348, 16551136352, 2348378261899, 533921776093322, 194297764330364986, 113166821986252773490, 105535296084137818939844, 157606962038222415838019755

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: A033277 A362103 A190533 * A134386 A200875 A215628

Adjacent sequences: A190599 A190600 A190601 * A190603 A190604 A190605

Keyword

nonn

Author

R. H. Hardin May 13 2011

Status

approved