A199223 Number of nX1 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 zero or one horizontal or vertical neighbors.

1, 1, 1, 6, 15, 15, 90, 226, 219, 1436, 3671, 3514, 24039, 62130, 58962, 415608, 1082718, 1021368, 7354732, 19274263, 18101068, 132456534, 348731568, 326374830, 2418406938, 6390767156, 5964605638, 44643259798, 118329627186, 110190867844

Offset

1,4

Comments

Column 1 of A199230

Links

R. H. Hardin, Table of n, a(n) for n = 1..175

Example

Some solutions for n=6
..0....0....0....0....0....0....0....0....0....0....0....0....0....0....0
..1....1....1....0....1....1....1....1....0....1....1....0....1....1....1
..2....2....0....1....0....1....1....2....1....0....2....1....1....2....2
..1....0....1....2....2....2....2....0....1....2....2....2....0....1....2
..2....1....2....2....1....0....2....2....2....2....0....1....2....0....1
..0....2....2....1....2....2....0....1....2....1....1....2....2....2....0

Crossrefs

Sequence in context: A201142 A200902 A205132 * A199094 A383166 A009579

Adjacent sequences: A199220 A199221 A199222 * A199224 A199225 A199226

Keyword

nonn

Author

R. H. Hardin, Nov 04 2011

Status

approved