A199249 Number of n X n 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 no element equal to any horizontal or vertical neighbor

1, 1, 114, 11223, 68639138, 208100267703

Offset

1,3

Comments

Diagonal of A199256

Links

Table of n, a(n) for n=1..6.

Example

Some solutions for n=4
..0..1..2..3....0..1..2..0....0..1..0..1....0..1..2..3....0..1..2..1
..3..2..3..1....2..3..1..3....1..2..3..2....1..2..0..2....3..0..3..0
..2..0..1..0....0..1..2..1....0..3..2..0....3..1..3..0....2..3..2..1
..3..1..0..2....3..2..0..3....3..1..3..2....1..3..0..2....3..2..1..0

Crossrefs

Sequence in context: A306194 A112485 A220685 * A199193 A188694 A188507

Adjacent sequences: A199246 A199247 A199248 * A199250 A199251 A199252

Keyword

nonn

Author

R. H. Hardin Nov 04 2011

Status

approved