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A190659 Half the number of n X n symmetric binary matrices with no element unequal to a strict majority of its king- and knight-move neighbors 0
1, 1, 1, 3, 3, 8, 20, 53, 141, 552, 2419, 12788, 78700, 561036, 4750312 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,4
LINKS
EXAMPLE
All solutions for n=5 with a(1,1)=0
..0..0..0..0..0....0..0..0..1..1....0..0..1..1..1
..0..0..0..0..0....0..0..0..1..1....0..0..1..1..1
..0..0..0..0..0....0..0..0..1..1....1..1..0..0..0
..0..0..0..0..0....1..1..1..0..0....1..1..0..0..0
..0..0..0..0..0....1..1..1..0..0....1..1..0..0..0
CROSSREFS
Sequence in context: A049974 A049972 A027376 * A202536 A038068 A267952
KEYWORD
nonn
AUTHOR
R. H. Hardin May 16 2011
STATUS
approved

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Last modified February 24 07:07 EST 2024. Contains 370294 sequences. (Running on oeis4.)