A205943 Number of (n+1) X 8 0..3 arrays with no 2 X 2 subblock having the number of clockwise edge increases equal to the number of counterclockwise edge increases in its adjacent leftward or upward neighbors.

33827496, 258956760, 4654724592, 72541287824, 1315300941940, 22850275822056, 451135236949228, 8471569888552480, 159117872993945456, 3048070811440138488

Offset

1,1

Comments

Column 7 of A205944.

Links

Table of n, a(n) for n=1..10.

Example

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

Crossrefs

Sequence in context: A184984 A143511 A178106 * A232636 A345121 A345122

Adjacent sequences: A205940 A205941 A205942 * A205944 A205945 A205946

Keyword

nonn

Author

R. H. Hardin, Feb 01 2012

Status

approved