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A208098
Number of 3 X n nonnegative integer arrays with new values 0 upwards introduced in row major order and no element equal to any horizontal, diagonal or antidiagonal neighbor (colorings ignoring permutations of colors).
2
1, 5, 34, 1573, 169064, 34438557, 11535531783, 5804338800147, 4121852595871393, 3947133396896179889, 4923290609971869799119, 7783034938833777039389506, 15253558021465456746321690675, 36391805974300638618769192592189, 104086634920105554145003030677202100
OFFSET
0,2
LINKS
EXAMPLE
Some solutions for n=4:
..0..1..0..2....0..1..0..1....0..1..2..0....0..1..0..1....0..1..0..1
..3..1..0..2....0..1..0..1....0..1..2..0....0..2..3..1....0..1..0..1
..0..1..0..1....2..1..2..1....0..1..2..0....0..1..0..4....0..1..0..1
CROSSREFS
Row 3 of A208096.
Sequence in context: A309534 A348375 A194687 * A216759 A144995 A173865
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 23 2012
EXTENSIONS
a(0)=1 prepended and terms a(9) and beyond from Andrew Howroyd, May 17 2020
STATUS
approved