A199521 Number of nX6 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

45, 15400, 174524175, 76066541392, 1049206835165446

Offset

1,1

Comments

Column 6 of A199523

Links

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

Example

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

Crossrefs

Sequence in context: A101994 A201004 A171118 * A007537 A287434 A225991

Adjacent sequences: A199518 A199519 A199520 * A199522 A199523 A199524

Keyword

nonn

Author

R. H. Hardin Nov 07 2011

Status

approved