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A199525
Number of -3..3 arrays x(0..n-1) of n elements with zero sum and no two consecutive zero elements
1
1, 6, 36, 212, 1324, 8342, 53302, 343710, 2232322, 14582218, 95702528, 630544704, 4168091856, 27630031358, 183604587444, 1222672695812, 8157398577024, 54515075729370, 364861668341252, 2445239266293460, 16407415704050100
OFFSET
1,2
COMMENTS
Column 3 of A199530
LINKS
EXAMPLE
Some solutions for n=5
..3...-2...-3...-1....0....1....3...-2....1....3...-2....0....1....2...-3....3
.-3....1....2....1....2....3....0....0...-3....3....0...-3...-3....1...-1...-2
..2....1...-3....0...-2...-1....1....2....0...-3...-1....1....2...-2....3....1
.-3....3....3....1...-2...-1...-3...-2...-1....0....3....2....1...-3...-2...-2
..1...-3....1...-1....2...-2...-1....2....3...-3....0....0...-1....2....3....0
CROSSREFS
Sequence in context: A268454 A171280 A250348 * A074436 A036162 A061708
KEYWORD
nonn
AUTHOR
R. H. Hardin Nov 07 2011
STATUS
approved