A190605 Number of (n+2)X(n+2) symmetric binary matrices without the pattern 1 0 1 diagonally or antidiagonally

44, 392, 5328, 119883, 4524432, 264917871, 24691633610, 3695710760736, 889996573057683, 344208553873787552, 212232817711368447264, 209378526541030232270145, 331234853208637544240698701

Offset

1,1

Links

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

Example

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

Crossrefs

Sequence in context: A024304 A190420 A228464 * A264555 A231217 A250336

Adjacent sequences: A190602 A190603 A190604 * A190606 A190607 A190608

Keyword

nonn

Author

R. H. Hardin May 13 2011

Status

approved