A190603 Number of (n+2)X(n+2) symmetric binary matrices without the pattern 1 0 1 vertically, antidiagonally or horizontally.

37, 246, 2435, 36125, 815754, 27533597, 1385237002, 104775207569, 11774001696187, 1960966610305152, 486160565780600788, 179685877495264963185, 99104740635101570708266

Offset

1,1

Links

R. H. Hardin, Table of n, a(n) for n = 1..23

Example

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

Crossrefs

Sequence in context: A142445 A155974 A384702 * A142627 A142308 A105463

Adjacent sequences: A190600 A190601 A190602 * A190604 A190605 A190606

Keyword

nonn

Author

R. H. Hardin, May 13 2011

Status

approved