A205064 Number of (n+1) X (n+1) 0..1 arrays with the number of rightwards and downwards edge increases in each 2 X 2 subblock differing from the number in all its horizontal and vertical neighbors.

16, 64, 144, 376, 856, 1984, 4480, 9856, 22144, 47104, 105472, 219136, 489472, 999424, 2228224, 4489216, 9994240, 19922944, 44302336, 87556096, 194510848, 381681664, 847249408, 1652555776, 3665821696

Offset

1,1

Links

Table of n, a(n) for n=1..25.

Example

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

Crossrefs

Diagonal of A205072.

Sequence in context: A277016 A016802 A309573 * A102860 A136264 A266103

Adjacent sequences: A205061 A205062 A205063 * A205065 A205066 A205067

Keyword

nonn,more

Author

R. H. Hardin, Jan 21 2012

Status

approved