A205244 Number of (n+1)X7 0..2 arrays with the number of rightwards and downwards edge increases in each 2X2 subblock differing from the number in each of its horizontal and vertical neighbors

677732, 25443411, 1334713506, 60907844595, 3053080325738, 145542216126349, 7109556887269900, 344112922016013626, 16763097381054518808

Offset

1,1

Comments

Column 6 of A205246

Links

Table of n, a(n) for n=1..9.

Example

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

Crossrefs

Sequence in context: A257360 A251884 A237005 * A119404 A014886 A253868

Adjacent sequences: A205241 A205242 A205243 * A205245 A205246 A205247

Keyword

nonn

Author

R. H. Hardin Jan 24 2012

Status

approved