A199360 Number of n X 3 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 one or two horizontal or vertical neighbors.

0, 0, 20, 23, 1655, 39597, 336788, 2130707, 97253704, 2328983293, 27777628803, 109663812046, 7330508486557, 181851333483598, 2032109646360324, 8979878533633165, 588003317861300327

Offset

1,3

Comments

Column 3 of A199363.

Links

Table of n, a(n) for n=1..17.

Example

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

Crossrefs

Cf. A199363.

Sequence in context: A303303 A045563 A013339 * A199585 A093716 A117737

Adjacent sequences: A199357 A199358 A199359 * A199361 A199362 A199363

Keyword

nonn

Author

R. H. Hardin Nov 05 2011

Status

approved