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A209954
Number of (n+1)X3 0..2 arrays with every 2X2 subblock having one, three or four distinct clockwise edge differences
1
567, 12161, 260201, 5569307, 119198607, 2551206049, 54603359537, 1168673933963, 25013090104279, 535354363340225, 11458172261417433, 245238893701357211, 5248840184974455807, 112340758338207683457, 2404425652140227799457
OFFSET
1,1
COMMENTS
Column 2 of A209960
LINKS
FORMULA
Empirical: a(n) = 24*a(n-1) -23*a(n-2) -678*a(n-3) -472*a(n-4) +1196*a(n-5) +448*a(n-6) -416*a(n-7)
EXAMPLE
Some solutions for n=4
..1..1..2....2..0..1....1..2..1....1..2..0....2..2..2....0..0..2....2..0..1
..1..1..2....2..0..2....1..1..1....1..2..1....1..1..0....0..0..0....0..0..0
..1..1..1....1..0..2....1..0..1....2..2..0....2..2..0....0..1..1....2..2..1
..0..1..2....1..2..1....2..2..2....0..0..0....1..0..1....0..0..1....2..0..0
..2..1..2....2..2..1....0..1..2....2..0..0....2..0..2....0..2..2....2..0..0
CROSSREFS
Sequence in context: A051372 A252599 A023099 * A233057 A087424 A134922
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 16 2012
STATUS
approved