A188325 Number of nondecreasing arrangements of n nonzero numbers in -(n-1)..(n-1) with sum zero

0, 1, 2, 10, 40, 197, 980, 5142, 27632, 152191, 853564, 4863492, 28075992, 163920550, 966421928, 5746596806, 34428962746, 207654949801, 1259963104618, 7686160299232, 47116518171284, 290105437233107, 1793451033655758

Offset

1,3

Comments

Column 1 of A188333

Links

R. H. Hardin, Table of n, a(n) for n = 1..32

Example

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

Crossrefs

Sequence in context: A335601 A151026 A151027 * A151028 A282619 A080252

Adjacent sequences: A188322 A188323 A188324 * A188326 A188327 A188328

Keyword

nonn

Author

R. H. Hardin Mar 28 2011

Status

approved