A199258 Number of 3nX2 0..2 arrays with values 0..2 introduced in row major order, the number of instances of each value within one of each other, and every element equal to exactly one horizontal or vertical neighbor

3, 36, 449, 6024, 83890, 1203424, 17634348, 262690636, 3964097574, 60448089272, 929736185578, 14403575178424, 224514368663504, 3518109050510528, 55381725681044520, 875329086340050012, 13884232495508832254

Offset

1,1

Comments

3n elements of column 2 of A199261

Links

R. H. Hardin, Table of n, a(n) for n = 1..99

Example

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

Crossrefs

Sequence in context: A249894 A099670 A259131 * A262465 A322491 A305678

Adjacent sequences: A199255 A199256 A199257 * A199259 A199260 A199261

Keyword

nonn

Author

R. H. Hardin Nov 04 2011

Status

approved