A199522 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 every element equal to two or fewer horizontal or vertical neighbors

105, 1030230, 5866391058, 14045226977086, 506637005741617919

Offset

1,1

Comments

Column 7 of A199523

Links

Table of n, a(n) for n=1..5.

Example

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

Crossrefs

Sequence in context: A096150 A068256 A062031 * A036201 A286287 A050810

Adjacent sequences: A199519 A199520 A199521 * A199523 A199524 A199525

Keyword

nonn

Author

R. H. Hardin Nov 07 2011

Status

approved