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A199841
Number of -2..2 arrays x(0..n-1) of n elements with zero sum and no element more than one greater than the previous
1
1, 3, 8, 23, 66, 192, 575, 1739, 5307, 16304, 50381, 156408, 487398, 1523663, 4776107, 15006513, 47247134, 149023605, 470794024, 1489462276, 4718330397, 14964219411, 47509518289, 150982994162, 480243297965, 1528796563830, 4870415108094
OFFSET
1,2
COMMENTS
Column 2 of A199847
LINKS
EXAMPLE
Some solutions for n=6
..2...-1....2....1....2....1....1....1....1...-1....2....1....1....1....1....1
..1....0....0...-1....1....1....2....1...-1....0....2....1....1....2....0....0
.-2....1....1....0....2....0....0....0...-1....1...-2....1....1....1....0...-1
.-1....0...-2....0...-1...-1....0....1....0....1...-1....0...-1...-1....0....0
..0....1...-1....0...-2....0...-2...-2....0....1...-1...-1....0...-1....1....0
..0...-1....0....0...-2...-1...-1...-1....1...-2....0...-2...-2...-2...-2....0
CROSSREFS
Sequence in context: A291037 A147704 A116410 * A106606 A050535 A025578
KEYWORD
nonn
AUTHOR
R. H. Hardin Nov 11 2011
STATUS
approved