A190537 Number of (n+2)X(n+2) symmetric binary matrices without the pattern 0 1 1 diagonally, vertically or horizontally.

39, 276, 2462, 30347, 497319, 11215564, 345643238, 14729798587, 868126086355, 71051142699591, 8082717906091557, 1279982834102896086, 282345340720841681874, 86807291886729731363231

Offset

1,1

Links

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

Example

Some solutions for 4X4
..1..1..1..0....0..0..0..1....1..1..0..0....0..1..0..1....1..0..0..1
..1..0..1..0....0..1..0..1....1..1..1..0....1..1..1..1....0..0..0..1
..1..1..0..0....0..0..0..0....0..1..0..1....0..1..0..0....0..0..0..0
..0..0..0..0....1..1..0..0....0..0..1..0....1..1..0..0....1..1..0..0

Crossrefs

Sequence in context: A070146 A372930 A327344 * A187095 A232874 A061169

Adjacent sequences: A190534 A190535 A190536 * A190538 A190539 A190540

Keyword

nonn

Author

R. H. Hardin, May 12 2011

Status

approved