A188330 Number of nondecreasing arrangements of n nonzero numbers in -(n+4)..(n+4) with sum zero

0, 6, 24, 136, 726, 4050, 22786, 130453, 755434, 4423012, 26136264, 155721334, 934541838, 5644979312, 34296099090, 209459048259, 1285320713656, 7921311099098, 49011099602408, 304342233975052, 1896163114078450

Offset

1,2

Comments

Column 6 of A188333

Links

R. H. Hardin, Table of n, a(n) for n = 1..27

Example

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

Crossrefs

Sequence in context: A027224 A110707 A047712 * A126267 A026947 A366757

Adjacent sequences: A188327 A188328 A188329 * A188331 A188332 A188333

Keyword

nonn

Author

R. H. Hardin Mar 28 2011

Status

approved