A205423 Number of (n+1)X(n+1) 0..3 arrays with the number of equal 2X2 subblock diagonal pairs and equal antidiagonal pairs differing from each horizontal or vertical neighbor, and new values 0..3 introduced in row major order

15, 1662, 1093244, 3163254256, 42782998259850

Offset

1,1

Comments

Diagonal of A205431

Links

Table of n, a(n) for n=1..5.

Example

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

Crossrefs

Sequence in context: A208000 A182925 A208020 * A263600 A208860 A195891

Adjacent sequences: A205420 A205421 A205422 * A205424 A205425 A205426

Keyword

nonn

Author

R. H. Hardin Jan 27 2012

Status

approved