A199255 Number of nX7 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.

41, 14160, 2913528, 267827143, 340245592285, 186725016600685

Offset

1,1

Comments

Column 7 of A199256

Links

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

Example

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

Crossrefs

Sequence in context: A240641 A106203 A289416 * A199200 A198602 A214338

Adjacent sequences: A199252 A199253 A199254 * A199256 A199257 A199258

Keyword

nonn

Author

R. H. Hardin, Nov 04 2011

Status

approved