A220940 Number of nX3 arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor

2, 208, 7551, 291080, 11115933, 424939090, 16241930112, 620799451653, 23728084357764, 906930211627870, 34664497553698238, 1324939111423377826, 50641541794670836181, 1935610258239045700193, 73982484134692519016233

Offset

1,1

Comments

Column 3 of A220943

Links

R. H. Hardin, Table of n, a(n) for n = 1..21

Example

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

Crossrefs

Sequence in context: A110899 A363461 A281126 * A012600 A157479 A355904

Adjacent sequences: A220937 A220938 A220939 * A220941 A220942 A220943

Keyword

nonn

Author

R. H. Hardin Dec 25 2012

Status

approved