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.

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

R. H. Hardin, Table of n, a(n) for n = 1..210

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

Adjacent sequences: A207045 A207046 A207047 * A207049 A207050 A207051

Keyword

nonn

Author

R. H. Hardin Feb 14 2012

Status

approved