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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A188333

LINKS

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

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 * A208356 A188489 A085657

Adjacent sequences:  A188321 A188322 A188323 * A188325 A188326 A188327

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 28 2011

STATUS

approved

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Last modified October 26 14:28 EDT 2021. Contains 348267 sequences. (Running on oeis4.)