A188326 - OEIS

A188326

Number of nondecreasing arrangements of n nonzero numbers in -n..n with sum zero

0, 2, 4, 20, 86, 424, 2128, 11200, 60372, 333254, 1872728, 10688284, 61792756, 361247006, 2132290212, 12692489494, 76115308712, 459476777038, 2790092370660, 17032567789840, 104478722395496, 643682329681246, 3981493201581658

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OFFSET

1,2

COMMENTS

Column 2 of A188333

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..31

EXAMPLE

Some solutions for n=6

.-6...-4...-6...-4...-4...-5...-6...-4...-6...-4...-6...-6...-5...-6...-5...-3

.-5...-4...-3...-1...-3...-2...-5...-3...-6...-4...-3...-6...-4...-5...-4...-1

..1...-2...-3...-1...-2...-2...-2...-2...-3...-1....2....2...-3....1...-2...-1

..1....3....3...-1...-1....1....3...-2....3...-1....2....2....2....2....2...-1

..4....3....4....2....4....2....4....5....6....5....2....3....5....3....3....1

..5....4....5....5....6....6....6....6....6....5....3....5....5....5....6....5

CROSSREFS

Sequence in context: A081440 A204438 A325791 * A158094 A108879 A341855

Adjacent sequences: A188323 A188324 A188325 * A188327 A188328 A188329

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 28 2011

STATUS

approved