A199097 Number of nX4 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 two or fewer horizontal or vertical neighbors.

6, 280, 5295, 732964, 38753124, 743464228, 115707966228, 6468027944244, 127149344295419, 20829692931992406, 1196759182608043852, 23839712978251419910, 4020627629769950572704, 234848943742720409725658

Offset

1,1

Comments

Column 4 of A199101

Links

R. H. Hardin, Table of n, a(n) for n = 1..24

Example

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

Crossrefs

Sequence in context: A254628 A211080 A288796 * A342983 A199093 A163015

Adjacent sequences: A199094 A199095 A199096 * A199098 A199099 A199100

Keyword

nonn

Author

R. H. Hardin, Nov 02 2011

Status

approved