A199358 Number of nX1 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, 0, 0, 0, 0, 0, 1, 4, 6, 4, 1, 10, 45, 105, 105, 735, 1935, 2270, 1001, 8854, 30961, 50669, 32706, 268440, 834720, 1164240, 614040, 5334840, 17805870, 27047395, 15771356, 135370824, 441296296, 646979039, 359653541, 3137738964, 10425704337

Offset

1,9

Comments

Column 1 of A199363

Links

R. H. Hardin, Table of n, a(n) for n = 1..121

Example

All solutions for n=10
..0....0....0....0....0....0
..0....0....0....0....0....0
..0....0....0....1....1....1
..1....1....1....1....1....1
..1....1....1....2....1....1
..2....1....2....2....2....2
..2....2....2....2....2....2
..2....2....3....3....3....2
..3....3....3....3....3....3
..3....3....3....3....3....3

Crossrefs

Sequence in context: A261638 A010670 A240444 * A131890 A062751 A135911

Adjacent sequences: A199355 A199356 A199357 * A199359 A199360 A199361

Keyword

nonn

Author

R. H. Hardin Nov 05 2011

Status

approved