A205602 Number of (n+1)X(n+1) 0..3 arrays with every 2X2 subblock having the same number of equal edges as its horizontal neighbors and a different number from its vertical neighbors, and new values 0..3 introduced in row major order

15, 1030, 229445, 146904738, 219511132715, 1046956456530150

Offset

1,1

Comments

Diagonal of A205609

Links

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

Example

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

Crossrefs

Sequence in context: A082158 A064625 A241331 * A370735 A233509 A206162

Adjacent sequences: A205599 A205600 A205601 * A205603 A205604 A205605

Keyword

nonn

Author

R. H. Hardin Jan 29 2012

Status

approved