A207047 Number of (n+1)X6 0..2 arrays with every 2X3 or 3X2 subblock having exactly one clockwise edge increases

4371, 2244, 2094, 3408, 4944, 7584, 13752, 20208, 31158, 55920, 81936, 125208, 223776, 327744, 500832, 895104, 1310976, 2003328, 3580416, 5243904, 8013312, 14321664, 20975616, 32053248, 57286656, 83902464, 128212992, 229146624

Offset

1,1

Comments

Column 5 of A207050

Links

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

Formula

Empirical: a(n) = 4*a(n-3) for n>13

Example

Some solutions for n=4
..1..0..2..2..0..0....2..0..0..2..1..1....2..2..0..0..2..1....2..2..2..2..1..0
..1..1..2..2..2..0....0..0..0..1..1..1....2..0..0..0..1..1....1..1..2..2..2..0
..1..1..1..2..2..2....0..0..1..1..1..0....0..0..0..1..1..1....1..1..1..2..2..2
..0..1..1..1..2..2....0..1..1..1..2..2....0..0..1..1..1..0....2..1..1..1..2..2
..0..0..1..1..1..1....1..1..1..2..2..2....0..1..1..1..2..2....2..2..1..1..1..1

Crossrefs

Sequence in context: A043874 A335326 A190135 * A001378 A028511 A101558

Adjacent sequences: A207044 A207045 A207046 * A207048 A207049 A207050

Keyword

nonn

Author

R. H. Hardin Feb 14 2012

Status

approved