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 A211036 1/3 the number of (2n)X(2n) 0..2 symmetric matrices with every element equal to two horizontal and vertical neighbors 0
 1, 6, 70, 1584, 69094, 5804980, 937523156, 290938653352, 173346851987198 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Table of n, a(n) for n=1..9. EXAMPLE Some solutions for n=2 ..2..2..0..0....1..1..0..0....0..0..0..0....0..0..2..2....2..2..1..1 ..2..2..0..0....1..1..0..0....0..1..1..0....0..0..2..2....2..2..1..1 ..0..0..1..1....0..0..2..2....0..1..1..0....2..2..0..0....1..1..0..0 ..0..0..1..1....0..0..2..2....0..0..0..0....2..2..0..0....1..1..0..0 CROSSREFS Sequence in context: A036361 A365057 A182563 * A284215 A050788 A241883 Adjacent sequences: A211033 A211034 A211035 * A211037 A211038 A211039 KEYWORD nonn AUTHOR R. H. Hardin Mar 30 2012 STATUS approved

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Last modified September 18 21:47 EDT 2024. Contains 376002 sequences. (Running on oeis4.)