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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. 1
17111320, 962953968, 163624211124, 46738310925116, 14510023537151756, 4561749663096542724, 1438784646024287898832, 454396326607940446880368, 143606330702285831573137588, 45403346502622885237604211100 (list; graph; refs; listen; history; text; internal format)
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

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Last modified October 20 03:04 EDT 2021. Contains 348099 sequences. (Running on oeis4.)