A209952 Number of (n+1)X(n+1) 0..2 arrays with every 2X2 subblock having one, three or four distinct clockwise edge differences

71, 12161, 14922177, 131724081683, 8356768819356343, 3811099763671947037073, 12493316536665519357482808705, 294391907024716464395174365141711571, 49864726192803453135807335081496483729871063

Offset

1,1

Comments

Diagonal of A209960

Links

R. H. Hardin, Table of n, a(n) for n = 1..12

Example

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

Crossrefs

Sequence in context: A200960 A260034 A250974 * A251382 A208679 A220980

Adjacent sequences: A209949 A209950 A209951 * A209953 A209954 A209955

Keyword

nonn

Author

R. H. Hardin Mar 16 2012

Status

approved