A205458 Number of (n+1)X(n+1) 0..3 arrays with the number of clockwise edge increases in every 2X2 subblock differing from each horizontal or vertical neighbor

256, 34792, 22414008, 69248994984, 1002427910938748, 68862365329186909360

Offset

1,1

Comments

Diagonal of A205466

Links

Table of n, a(n) for n=1..6.

Example

Some solutions for n=4
..0..3..3..0..1....1..1..3..3..0....0..3..2..1..0....2..0..3..1..1
..0..1..0..0..2....3..1..0..3..2....2..2..3..0..1....2..1..1..2..0
..1..2..0..0..0....1..2..2..0..0....1..3..3..1..1....3..3..2..2..1
..0..3..1..3..1....2..2..2..0..0....1..3..3..0..2....1..0..0..3..0
..1..0..0..1..1....2..2..3..2..0....3..0..1..1..1....3..3..1..1..3

Crossrefs

Sequence in context: A205362 A206101 A221091 * A206744 A207791 A018798

Adjacent sequences: A205455 A205456 A205457 * A205459 A205460 A205461

Keyword

nonn

Author

R. H. Hardin Jan 27 2012

Status

approved