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A199528
Number of -6..6 arrays x(0..n-1) of n elements with zero sum and no two consecutive zero elements
1
1, 12, 126, 1432, 16682, 197962, 2378412, 28844590, 352355640, 4329146404, 53439881140, 662256127274, 8234161234932, 102668802658902, 1283270183281782, 16074009129375488, 201718956009659774, 2535677513896048744
OFFSET
1,2
COMMENTS
Column 6 of A199530
LINKS
EXAMPLE
Some solutions for n=5
.-3...-3....3...-1...-2...-5...-4....4...-5....0...-3....2...-2....4....4....5
..1....1....4...-1....3...-1....3...-1...-2...-2....2....3....3....1...-1...-3
..1....5...-3....2...-5....0...-2...-2....0....4...-6...-5...-3....0....4....1
.-5....2....0....1....1....5....6...-3....6...-3....4...-3....1...-4...-5....0
..6...-5...-4...-1....3....1...-3....2....1....1....3....3....1...-1...-2...-3
CROSSREFS
Sequence in context: A101602 A264896 A062199 * A124797 A204768 A045508
KEYWORD
nonn
AUTHOR
R. H. Hardin Nov 07 2011
STATUS
approved