A205640 Number of (n+1)X7 0..3 arrays with every 2 X 2 subblock having the number of clockwise edge increases equal to the number of counterclockwise edge increases in its adjacent leftward and upward neighbors.

17111320, 962953968, 163624211124, 46738310925116, 14510023537151756, 4561749663096542724, 1438784646024287898832, 454396326607940446880368, 143606330702285831573137588, 45403346502622885237604211100

Offset

1,1

Comments

Column 6 of A205642.

Links

R. H. Hardin, Table of n, a(n) for n = 1..18

Example

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

Crossrefs

Sequence in context: A143510 A043680 A204673 * A175271 A172597 A172569

Adjacent sequences: A205637 A205638 A205639 * A205641 A205642 A205643

Keyword

nonn

Author

R. H. Hardin, Jan 29 2012

Status

approved