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A188324
Number of nondecreasing arrangements of n nonzero numbers in -(2n-2)..(2n-2) with sum zero
1
0, 2, 8, 61, 472, 4050, 36454, 341988, 3306612, 32757830, 330964946, 3398830478, 35386215292, 372754193214, 3966423984516, 42579631811396, 460648926971334, 5017891492413126, 54996459314116816, 606092251444553993
OFFSET
1,2
COMMENTS
Diagonal of A188333
LINKS
EXAMPLE
Some solutions for n=6
.-9...-8...-8...-6...-9...-7..-10..-10..-10...-8...-8...-8...-9...-7...-6...-7
.-1...-1...-6...-2...-5...-7...-7...-2...-2...-7...-7...-4...-6...-7...-5...-6
.-1...-1...-3...-1...-4...-3....1...-2...-2...-2....1...-4...-2...-2...-2....1
..1...-1....4....3....1....5....3...-2....2...-1....2...-4...-2....2...-1....3
..5....2....5....3....8....5....4....8....3....9....3...10....9....6....6....3
..5....9....8....3....9....7....9....8....9....9....9...10...10....8....8....6
CROSSREFS
Sequence in context: A321979 A139017 A322012 * A368450 A370913 A208356
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 28 2011
STATUS
approved