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A190422
Number of (n+2)X(n+2) symmetric binary matrices without the pattern 1 1 1 diagonally, vertically, antidiagonally or horizontally
0
34, 254, 3444, 76352, 2733816, 163925231, 16307921090, 2666369228454, 724501421348158, 326444188458835963, 242909750685458209759, 299419887986747081985221, 611366002048450741040107233
OFFSET
1,1
EXAMPLE
Some solutions for n=2
..1..1..0..0....1..0..1..0....0..1..1..0....1..1..0..1....0..1..1..0
..1..1..0..0....0..0..0..1....1..0..1..0....1..1..0..1....1..0..0..0
..0..0..0..1....1..0..0..0....1..1..0..0....0..0..0..0....1..0..0..1
..0..0..1..0....0..1..0..1....0..0..0..0....1..1..0..0....0..0..1..0
CROSSREFS
Sequence in context: A020872 A302474 A183319 * A209951 A209944 A371403
KEYWORD
nonn
AUTHOR
R. H. Hardin May 10 2011
STATUS
approved