login
A190601
Number of (n+2)X(n+2) symmetric binary matrices without the pattern 1 0 1 antidiagonally
1
48, 576, 11520, 403200, 25401600, 2743372800, 526727577600, 176980466073600, 104064514051276800, 107810836557122764800, 195461046678063572582400, 622543433669632478674944000, 3480017794213245555792936960000
OFFSET
1,1
LINKS
EXAMPLE
Some solutions for 4X4
..0..1..0..1....1..0..0..1....0..1..0..1....1..1..1..0....1..1..0..0
..1..0..1..1....0..0..0..0....1..1..1..1....1..1..0..0....1..0..1..0
..0..1..1..1....0..0..0..0....0..1..1..1....1..0..1..0....0..1..1..0
..1..1..1..1....1..0..0..0....1..1..1..0....0..0..0..1....0..0..0..1
CROSSREFS
Sequence in context: A192832 A352847 A042949 * A179404 A171343 A151624
KEYWORD
nonn
AUTHOR
R. H. Hardin May 13 2011
STATUS
approved