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A191482 Number of n X n symmetric binary matrices with each 1 adjacent to no more than 6 king-move neighboring 1s 1
2, 8, 61, 932, 28310, 1702795, 202939372, 47927020569, 22429704522082, 20801275290690832, 38227523793468047029, 139214024121151998219523, 1004640378392088270863934462, 14366768178214114259445967952070 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
EXAMPLE
Some solutions for n=4
..0..1..0..0....1..1..0..1....1..0..0..0....1..0..1..0....1..1..1..0
..1..0..1..1....1..1..1..0....0..0..1..1....0..0..1..1....1..1..0..1
..0..1..1..0....0..1..0..1....0..1..1..1....1..1..1..1....1..0..1..0
..0..1..0..0....1..0..1..1....0..1..1..0....0..1..1..0....0..1..0..0
CROSSREFS
Sequence in context: A085657 A005215 A058862 * A140722 A327078 A332779
KEYWORD
nonn
AUTHOR
R. H. Hardin Jun 03 2011
STATUS
approved

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Last modified July 15 19:27 EDT 2024. Contains 374334 sequences. (Running on oeis4.)