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A190418
Number of (n+2)X(n+2) symmetric binary matrices without the pattern 1 1 1 vertically, antidiagonally or horizontally
1
37, 290, 4174, 103218, 4268160, 302857233, 36530501839, 7448773789365, 2604518117252310, 1552614799946248963, 1570623177380821866672, 2710542814101229129928033, 7970415278138699394079102815
OFFSET
1,1
LINKS
EXAMPLE
Some solutions for n=2
..0..1..1..0....1..1..0..1....0..0..0..1....0..1..0..1....0..0..0..1
..1..0..0..0....1..0..0..0....0..1..0..0....1..1..0..0....0..1..0..0
..1..0..0..1....0..0..0..1....0..0..0..0....0..0..0..0....0..0..1..1
..0..0..1..0....1..0..1..0....1..0..0..0....1..0..0..0....1..0..1..1
CROSSREFS
Sequence in context: A215632 A165381 A086840 * A200889 A211156 A217642
KEYWORD
nonn
AUTHOR
R. H. Hardin May 10 2011
STATUS
approved