A188331 Number of nondecreasing arrangements of n nonzero numbers in -(n+5)..(n+5) with sum zero.

0, 7, 32, 191, 1076, 6252, 36454, 214784, 1274786, 7621670, 45861804, 277601505, 1689349524, 10331083034, 63462615822, 391449573689, 2423684611456, 15058835953673, 93865873942596, 586844454182810, 3679133098371548

Offset

1,2

Comments

Column 7 of A188333.

Links

R. H. Hardin, Table of n, a(n) for n = 1..26

Example

Some solutions for n=6
-10..-10..-11...-4...-4...-5..-10..-11..-11...-6...-6...-7...-7...-5..-11..-10
.-6...-1...-8...-4...-4...-5...-6...-5...-5...-4...-2...-5...-6...-5...-8...-9
.-3...-1...-5...-4...-3...-2...-6...-2...-1...-2...-2....1...-5...-3...-3....4
..4....4....6....1...-1....1....2....1....4....2...-2....1....3....2....6....5
..5....4....9....4....4....4....9....8....4....3....4....3....7....5....6....5
.10....4....9....7....8....7...11....9....9....7....8....7....8....6...10....5

Crossrefs

Cf. A188333.

Sequence in context: A050148 A188208 A302995 * A177766 A240390 A024093

Adjacent sequences: A188328 A188329 A188330 * A188332 A188333 A188334

Keyword

nonn

Author

R. H. Hardin, Mar 28 2011

Status

approved