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A188210 Number of nondecreasing arrangements of n numbers in -(n+6)..(n+6) with sum zero 1
1, 9, 50, 318, 1944, 11963, 73316, 450096, 2767118, 17052653, 105356398, 652694106, 4054512228, 25254176312, 157709971144, 987358943331, 6196330627807, 38975339759358, 245693231541360, 1552021349807456, 9823321416340666 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 8 of A188211

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..25

EXAMPLE

Some solutions for n=3

.-3...-7...-4...-5...-2...-4...-5...-9...-8...-9...-6...-3...-4...-7...-3...-6

.-3....0...-3...-2...-2....1...-4....2....1....3....2...-1...-1....1....1....1

..6....7....7....7....4....3....9....7....7....6....4....4....5....6....2....5

CROSSREFS

Sequence in context: A007681 A279972 A115366 * A221246 A002462 A210061

Adjacent sequences:  A188207 A188208 A188209 * A188211 A188212 A188213

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 24 2011

STATUS

approved

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Last modified February 16 19:49 EST 2019. Contains 320167 sequences. (Running on oeis4.)