A206147 Number of (n+1) X 6 0..2 arrays with every 2 X 3 or 3 X 2 subblock having exactly three counterclockwise and three clockwise edge increases.

1458, 23346, 379602, 6204438, 101596896, 1664748270, 27284864220, 447232269654, 7330916855718, 120167900345196, 1969792468989480, 32288891319485190, 529280670290557896, 8675989562774602188, 142217172462541690296

Offset

1,1

Comments

Column 5 of A206150.

Links

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

Formula

Empirical: a(n) = 30*a(n-1) - 291*a(n-2) + 1278*a(n-3) - 2901*a(n-4) + 3519*a(n-5) - 2152*a(n-6) + 516*a(n-7).

Example

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

Crossrefs

Sequence in context: A255345 A091715 A224528 * A035764 A107560 A276101

Adjacent sequences: A206144 A206145 A206146 * A206148 A206149 A206150

Keyword

nonn

Author

R. H. Hardin, Feb 04 2012

Status

approved