A205512 Number of (n+1)X(n+1) 0..2 arrays with the number of clockwise edge increases in every 2X2 subblock differing from each horizontal or vertical neighbor

81, 2412, 205803, 44160240, 25618992453, 37886453633808, 153727495029223899, 1571194548319712891100

Offset

1,1

Comments

Diagonal of A205520

Links

Table of n, a(n) for n=1..8.

Example

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

Crossrefs

Sequence in context: A128832 A085877 A123219 * A297606 A236729 A236147

Adjacent sequences: A205509 A205510 A205511 * A205513 A205514 A205515

Keyword

nonn

Author

R. H. Hardin Jan 28 2012

Status

approved