A190534 - OEIS

A190534

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

42, 282, 2156, 22640, 316238, 6107152, 160575506, 5870861789, 297355717075, 20939485177609, 2053441860491509, 280623087234506165, 53465534329788380473, 14206838360639441172569, 5266500605033810191697624

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..30

EXAMPLE

Some solutions for 4X4

..0..0..0..0....1..0..0..1....1..1..1..1....0..1..0..0....0..1..0..1

..0..1..0..1....0..0..0..1....1..1..1..0....1..0..0..0....1..0..0..0

..0..0..1..0....0..0..1..0....1..1..0..0....0..0..0..1....0..0..0..0

..0..1..0..1....1..1..0..0....1..0..0..1....0..0..1..0....1..0..0..1

CROSSREFS

Sequence in context: A309925 A188058 A036463 * A248466 A233407 A272139

Adjacent sequences: A190531 A190532 A190533 * A190535 A190536 A190537

KEYWORD

nonn

AUTHOR

R. H. Hardin May 12 2011

STATUS

approved