A206183 Number of (n+1) X 4 0..3 arrays with every 2 X 2 subblock having the same number of clockwise edge increases as its horizontal neighbors and the same number of counterclockwise edge increases as its vertical neighbors.

15616, 205804, 3802676, 95187756, 2674444796, 78597249508, 2345626036136, 70435464744476, 2120394113295768, 63902858041046532, 1926797824397810952, 58109661058209293020, 1752687447844172570092, 52866528655142833934812

Offset

1,1

Comments

Column 3 of A206188.

Links

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

Example

Some solutions for n=4:
..2..1..0..1....2..3..2..0....1..3..2..0....1..0..0..0....1..2..1..3
..1..3..1..2....2..3..0..0....3..3..0..0....0..3..2..1....2..3..2..0
..0..1..3..1....0..0..2..1....1..0..3..1....0..2..2..1....0..1..3..1
..2..3..1..2....3..0..1..1....0..0..1..1....0..1..1..1....1..2..0..3
..3..0..2..3....2..2..0..2....2..1..0..3....1..0..3..2....0..1..3..0

Crossrefs

Sequence in context: A262793 A206104 A205654 * A205365 A254029 A129152

Adjacent sequences: A206180 A206181 A206182 * A206184 A206185 A206186

Keyword

nonn

Author

R. H. Hardin, Feb 04 2012

Status

approved