A205346 Number of (n+1)X(n+1) 0..3 arrays with no 2X2 subblock having the same number of equal edges as its horizontal or vertical neighbors, and new values 0..3 introduced in row major order

15, 1750, 1080457, 2423004172, 21200252524407

Offset

1,1

Comments

Diagonal of A205352

Links

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

Example

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

Crossrefs

Sequence in context: A195521 A122184 A069450 * A208868 A070862 A077730

Adjacent sequences: A205343 A205344 A205345 * A205347 A205348 A205349

Keyword

nonn

Author

R. H. Hardin Jan 26 2012

Status

approved