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A190420
Number of (n+2)X(n+2) symmetric binary matrices without the pattern 1 1 1 diagonally or antidiagonally
1
44, 363, 6072, 191360, 10093200, 935338785, 154543989072, 44556415740672, 22668584136931568, 20377347136466565883, 32182451728510291871740, 89502269428191719999392640, 438593646987789744491801743584
OFFSET
1,1
LINKS
EXAMPLE
Some solutions for n=2
..1..1..0..1....1..1..0..0....1..1..1..0....0..1..0..0....1..0..0..1
..1..1..0..0....1..1..0..0....1..0..1..0....1..0..0..0....0..0..0..1
..0..0..0..0....0..0..0..0....1..1..0..0....0..0..1..1....0..0..0..0
..1..0..0..0....0..0..0..1....0..0..0..1....0..0..1..0....1..1..0..0
CROSSREFS
Sequence in context: A183633 A200450 A024304 * A228464 A190605 A264555
KEYWORD
nonn
AUTHOR
R. H. Hardin May 10 2011
STATUS
approved