A206674 Number of (n+1) X 7 0..2 arrays with no 2 X 2 subblock having the same number of clockwise edge increases as its horizontal neighbors or the same number of counterclockwise edge increases as its vertical neighbors.

160218, 1242930, 11368056, 97476666, 968502540, 9838056114, 108434010612, 1216758803376, 14276840963340, 169607787123510, 2060425946665152, 25191450280358046, 311526062730648630, 3864886491109553556

Offset

1,1

Comments

Column 6 of A206676.

Links

R. H. Hardin, Table of n, a(n) for n = 1..78

Example

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

Crossrefs

Sequence in context: A251971 A013897 A205742 * A205518 A141816 A097626

Adjacent sequences: A206671 A206672 A206673 * A206675 A206676 A206677

Keyword

nonn

Author

R. H. Hardin, Feb 11 2012

Status

approved