A199231 Number of nX2 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 at least one horizontal or vertical neighbor

0, 0, 3, 12, 31, 143, 1183, 5068, 11594, 133430, 632580, 1198596, 16002429, 78638190, 139661368, 1990115356, 9953302579, 17313999205, 254272220438, 1284820132294, 2223104240738, 33166493583372, 168734504757571, 291907971810015

Offset

1,3

Comments

Column 2 of A199237

Links

R. H. Hardin, Table of n, a(n) for n = 1..94

Example

Some solutions for n=4
..0..0....0..1....0..1....0..1....0..0....0..0....0..0....0..0....0..0....0..0
..0..1....0..1....0..1....0..1....1..0....1..1....0..1....1..2....1..0....0..1
..1..1....0..1....0..2....2..1....1..2....2..1....2..1....1..2....1..1....2..1
..2..2....2..2....2..2....2..2....1..2....2..2....2..1....1..2....2..2....2..2

Crossrefs

Sequence in context: A131740 A037237 A005718 * A098500 A037236 A309693

Adjacent sequences: A199228 A199229 A199230 * A199232 A199233 A199234

Keyword

nonn

Author

R. H. Hardin Nov 04 2011

Status

approved