A199361 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 one or two horizontal or vertical neighbors

0, 5, 23, 2857, 37995, 2838998, 76784986, 4127669738, 153225233815

Offset

1,2

Comments

Column 4 of A199363

Links

Table of n, a(n) for n=1..9.

Example

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

Crossrefs

Sequence in context: A299360 A002811 A177134 * A199586 A120488 A309210

Adjacent sequences: A199358 A199359 A199360 * A199362 A199363 A199364

Keyword

nonn

Author

R. H. Hardin Nov 05 2011

Status

approved