A207797 Number of (n+1) X 7 0..3 arrays with every 2 X 3 or 3 X 2 subblock having an unequal number of clockwise and counterclockwise edge increases.

15376544, 3276916896, 873499447968, 242220624640736, 68409320823594368

Offset

1,1

Comments

Column 6 of A207799.

Links

Table of n, a(n) for n=1..5.

Example

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

Crossrefs

Sequence in context: A186616 A128480 A273355 * A186050 A121840 A345618

Adjacent sequences: A207794 A207795 A207796 * A207798 A207799 A207800

Keyword

nonn

Author

R. H. Hardin, Feb 20 2012

Status

approved