A199586 Number of nX4 0..3 arrays with values 0..3 introduced in row major order, the number of instances of each value within one of each other, and every element equal to at least one horizontal or vertical neighbor

0, 5, 23, 2943, 69023, 4748991, 207722398, 12106398432, 637249804809, 36336881030430

Offset

1,2

Comments

Column 4 of A199588

Links

Table of n, a(n) for n=1..10.

Example

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

Crossrefs

Sequence in context: A002811 A177134 A199361 * A120488 A309210 A345880

Adjacent sequences: A199583 A199584 A199585 * A199587 A199588 A199589

Keyword

nonn

Author

R. H. Hardin Nov 08 2011

Status

approved