A188329 Number of nondecreasing arrangements of n nonzero numbers in -(n+3)..(n+3) with sum zero

0, 5, 18, 94, 472, 2519, 13694, 76251, 431488, 2477726, 14399942, 84570550, 501197804, 2994043007, 18012040166, 109041492241, 663838548026, 4061954970953, 24969125105686, 154130498547414, 955070091156516

Offset

1,2

Comments

Column 5 of A188333

Links

R. H. Hardin, Table of n, a(n) for n = 1..24

Example

Some solutions for n=6
.-7...-7...-6...-8...-8...-6...-9...-8...-8...-9...-8...-8...-7...-8...-9...-7
.-6...-5...-6...-3...-5...-6...-7...-6...-5...-6...-6...-8...-3...-8...-5...-3
.-1...-2...-4...-2...-4...-6....1....1...-2....1....2...-1...-1....2....3....1
..4....1...-2....2....4....3....3....2...-1....3....3....5...-1....2....3....2
..5....5....9....4....4....6....5....4....7....3....4....6....5....5....4....2
..5....8....9....7....9....9....7....7....9....8....5....6....7....7....4....5

Crossrefs

Sequence in context: A097574 A113023 A174082 * A165962 A127756 A228614

Adjacent sequences: A188326 A188327 A188328 * A188330 A188331 A188332

Keyword

nonn

Author

R. H. Hardin Mar 28 2011

Status

approved