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A220940 Number of nX3 arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor 1
2, 208, 7551, 291080, 11115933, 424939090, 16241930112, 620799451653, 23728084357764, 906930211627870, 34664497553698238, 1324939111423377826, 50641541794670836181, 1935610258239045700193, 73982484134692519016233 (list; graph; refs; listen; history; text; internal format)
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: A238819 A110899 A281126 * A012600 A157479 A092700

Adjacent sequences:  A220937 A220938 A220939 * A220941 A220942 A220943

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 25 2012

STATUS

approved

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Last modified September 28 06:57 EDT 2021. Contains 347703 sequences. (Running on oeis4.)