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A191479 Number of n X n symmetric binary matrices with each 1 adjacent to no more than 3 king-move neighboring 1s 1
2, 8, 42, 445, 8336, 273578, 16060725, 1663317205, 304789975903, 99026690954574, 56934478978072688, 57952230532394115913, 104449989219446543530778, 333288010626782017792094457, 1882901103468898454919475637369 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
EXAMPLE
Some solutions for n=4
..1..1..0..0....0..1..0..0....0..0..1..1....0..0..1..0....0..1..0..1
..1..0..1..0....1..1..0..1....0..1..0..0....0..0..1..0....1..1..0..1
..0..1..0..0....0..0..0..0....1..0..0..1....1..1..0..1....0..0..0..1
..0..0..0..0....0..1..0..0....1..0..1..1....0..0..1..1....1..1..1..0
CROSSREFS
Sequence in context: A153524 A153552 A295199 * A197935 A267619 A012917
KEYWORD
nonn
AUTHOR
R. H. Hardin Jun 03 2011
STATUS
approved

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Last modified June 17 21:09 EDT 2024. Contains 373464 sequences. (Running on oeis4.)