A199125 Number of n X n 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 no element equal to any horizontal or vertical neighbor

1, 2, 6, 258, 11475, 438502, 358599045, 247746055048, 141388449764548

Offset

1,2

Comments

Diagonal of A199133

Links

Table of n, a(n) for n=1..9.

Example

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

Crossrefs

Sequence in context: A181772 A183398 A052342 * A232696 A007190 A164829

Adjacent sequences: A199122 A199123 A199124 * A199126 A199127 A199128

Keyword

nonn

Author

R. H. Hardin Nov 03 2011

Status

approved