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A190417
Number of (n+2)X(n+2) symmetric binary matrices without the pattern 1 1 1 vertically or horizontally
1
45, 497, 9580, 319760, 18980021, 1980733945, 363632891784, 117655174702396, 67024501865532719, 67232893079939036305, 118774251891797912665388, 369496334618903888548799176, 2024200318811320542229843621759
OFFSET
1,1
LINKS
EXAMPLE
Some solutions for n=2
..0..1..0..0....0..0..0..1....0..0..1..1....0..0..0..0....1..0..0..0
..1..0..0..0....0..1..0..1....0..1..0..0....0..1..0..1....0..1..0..0
..0..0..1..0....0..0..1..0....1..0..1..0....0..0..1..1....0..0..0..0
..0..0..0..1....1..1..0..1....1..0..0..1....0..1..1..0....0..0..0..0
CROSSREFS
Sequence in context: A086576 A295319 A147808 * A093529 A197501 A283116
KEYWORD
nonn
AUTHOR
R. H. Hardin May 10 2011
STATUS
approved