A199528 Number of -6..6 arrays x(0..n-1) of n elements with zero sum and no two consecutive zero elements

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

R. H. Hardin, Table of n, a(n) for n = 1..200

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

Adjacent sequences: A199525 A199526 A199527 * A199529 A199530 A199531

Keyword

nonn

Author

R. H. Hardin Nov 07 2011

Status

approved