A199037 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 one or two horizontal or vertical neighbors

0, 12, 127, 3916, 86544, 674064, 35902575, 750625102, 5442674205, 326415070048, 6891880687104, 50123775833686, 3107281380843015, 66459989877060602, 486615013344919101, 30688654869734908624, 662760542913624114980

Offset

1,2

Comments

Column 4 of A199041

Links

R. H. Hardin, Table of n, a(n) for n = 1..18

Example

Some solutions for n=5
..0..0..1..1....0..0..1..1....0..1..2..2....0..1..1..0....0..1..2..2
..2..0..1..0....2..2..1..1....0..1..0..1....0..2..2..0....0..1..1..1
..2..1..2..0....2..1..0..0....2..0..0..1....0..1..2..2....2..0..0..1
..1..1..2..0....2..1..2..0....2..1..2..2....0..1..1..1....2..1..1..2
..2..2..2..0....0..0..2..2....2..1..0..0....2..2..2..1....2..0..0..2

Crossrefs

Sequence in context: A215774 A275941 A173359 * A099157 A239407 A360878

Adjacent sequences: A199034 A199035 A199036 * A199038 A199039 A199040

Keyword

nonn

Author

R. H. Hardin Nov 02 2011

Status

approved