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A184690
1/3 the number of nX5 0..2 arrays with no element equal both to the element above and to the element to its left
1
81, 12288, 1841856, 275895264, 41325395328, 6189975781728, 927173138866560, 138877768818516672, 20801977386689522208, 3115849763962378244064, 466711388591033629230624, 69906939275393719770229056
OFFSET
1,1
COMMENTS
Column 5 of A184694
LINKS
FORMULA
Empirical: a(n)=171*a(n-1)-3370*a(n-2)+29805*a(n-3)-149108*a(n-4)+447784*a(n-5)-778496*a(n-6)+649216*a(n-7)-114688*a(n-8)
EXAMPLE
Some solutions for 3X5 with a(1,1)=0
..0..1..2..1..0....0..0..0..1..0....0..0..0..2..1....0..1..1..1..0
..0..1..0..2..1....0..2..0..2..2....0..1..2..0..0....0..1..0..1..1
..0..1..1..0..2....0..2..1..0..2....0..2..0..2..0....0..1..0..0..2
CROSSREFS
Sequence in context: A053913 A053895 A053905 * A143005 A187432 A017104
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 20 2011
STATUS
approved