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A190658
Half the number of n X n symmetric binary matrices with no element unequal to a strict majority of its vertical, antidiagonal and horizontal neighbors
1
1, 1, 3, 8, 38, 252, 2107, 22478, 331824, 6625044, 173531500, 6026107049, 280634679581, 17440962165250, 1440182982082321, 158309818157320775, 23213155114911168104, 4535580909418217659991, 1179764335891702406715256
OFFSET
1,3
LINKS
EXAMPLE
Some solutions for n=5 with a(1,1)=0
..0..0..1..1..1....0..0..1..0..0....0..0..0..1..1....0..0..1..1..1
..0..1..1..1..0....0..1..1..0..0....0..0..0..1..1....0..1..1..1..1
..1..1..1..0..0....1..1..1..1..1....0..0..1..1..1....1..1..1..1..1
..1..1..0..0..1....0..0..1..1..0....1..1..1..1..1....1..1..1..1..0
..1..0..0..1..1....0..0..1..0..0....1..1..1..1..1....1..1..1..0..0
CROSSREFS
Sequence in context: A089066 A099030 A264657 * A366629 A106558 A065914
KEYWORD
nonn
AUTHOR
R. H. Hardin May 16 2011
STATUS
approved