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A190627
Half the number of n X n symmetric binary matrices with no element equal to a strict majority of its king-move neighbors
0
1, 1, 3, 9, 46, 462, 6253, 132061, 4611023, 250827373, 21305367718, 2862744251998, 605949209796465, 201612254630124309
OFFSET
1,3
EXAMPLE
Some solutions for n=4 with a(1,1)=0
..0..1..1..0....0..1..0..1....0..1..0..1....0..1..0..0....0..1..0..1
..1..0..0..1....1..1..0..1....1..1..0..0....1..0..1..1....1..1..0..1
..1..0..0..1....0..0..0..1....0..0..1..1....0..1..0..0....0..0..1..0
..0..1..1..0....1..1..1..0....1..0..1..0....0..1..0..1....1..1..0..1
CROSSREFS
Sequence in context: A107090 A190625 A317079 * A221986 A018445 A129432
KEYWORD
nonn
AUTHOR
R. H. Hardin May 14 2011
STATUS
approved