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A207048
Number of (n+1) X 7 0..2 arrays with every 2 X 3 or 3 X 2 subblock having exactly one clockwise edge increases.
1
13386, 4722, 3408, 4836, 7584, 11712, 19200, 30528, 48096, 78744, 125184, 196320, 316128, 500832, 785280, 1264512, 2003328, 3141120, 5058048, 8013312, 12564480, 20232192, 32053248, 50257920, 80928768, 128212992, 201031680, 323715072
OFFSET
1,1
COMMENTS
Column 6 of A207050.
LINKS
FORMULA
Empirical: a(n) = 4*a(n-3) n > 14.
EXAMPLE
Some solutions for n=4
..1..2..2..1..1..1..2....0..2..1..1..2..2..2....1..0..2..2..0..0..0
..1..2..2..2..1..1..1....0..0..1..1..1..2..2....1..1..2..2..2..0..0
..1..1..2..2..2..1..1....0..0..0..1..1..1..2....1..1..1..2..2..2..0
..1..1..1..2..2..2..0....1..0..0..0..1..1..1....2..1..1..1..2..2..2
..0..1..1..1..2..2..2....1..1..0..0..0..1..1....2..0..1..1..1..2..2
CROSSREFS
Cf. A207050.
Sequence in context: A235297 A252240 A220060 * A083598 A238295 A291913
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 14 2012
STATUS
approved