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A188120 Number of strictly increasing arrangements of n nonzero numbers in -(n+5)..(n+5) with sum zero 1
0, 7, 24, 118, 482, 1999, 8044, 32035, 126122, 493267, 1918884, 7436318, 28736532, 110822456, 426763772, 1641751842, 6311555602, 24254371734, 93187581596, 358022612486, 1375631211812, 5286588768343, 20321901846262, 78143777698585 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 7 of A188122

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..26

EXAMPLE

Some solutions for n=6

.-7..-10...-9...-6...-5..-11..-11..-11...-9...-6..-11...-7..-11...-8...-7...-8

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

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

..3....3....2...-1...-1....7....2....4...-1....1....3...-1....3...-1....2....1

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

..7...11....9....9....8...10...10...10...10....7...10...11....9....9....8....7

CROSSREFS

Sequence in context: A321390 A283457 A129797 * A007750 A153577 A009643

Adjacent sequences:  A188117 A188118 A188119 * A188121 A188122 A188123

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 21 2011

STATUS

approved

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Last modified December 1 11:38 EST 2021. Contains 349429 sequences. (Running on oeis4.)