A190342 Number of (n+1)X(n+1) symmetric binary matrices without the pattern 1 1 vertically, antidiagonally or horizontally

4, 12, 52, 308, 2520, 29268, 471012, 10566004, 331575100, 14510475976, 885694047808, 75478844279780, 8975435807171244, 1489232331953993836, 344849471434261285096, 111434896145450843664604

Offset

1,1

Links

R. H. Hardin, Table of n, a(n) for n = 1..39

Example

Some solutions for 3X3
..0..0..0....0..0..1....1..0..1....1..0..0....0..0..0....1..0..0....0..0..0
..0..0..0....0..0..0....0..0..0....0..0..0....0..0..0....0..1..0....0..1..0
..0..0..0....1..0..0....1..0..0....0..0..1....0..0..1....0..0..1....0..0..0

Crossrefs

Sequence in context: A277431 A065525 A317281 * A262745 A180381 A149413

Adjacent sequences: A190339 A190340 A190341 * A190343 A190344 A190345

Keyword

nonn

Author

R. H. Hardin May 09 2011

Status

approved