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A188119 Number of strictly increasing arrangements of n nonzero numbers in -(n+4)..(n+4) with sum zero 1
0, 6, 18, 80, 296, 1154, 4376, 16547, 62222, 233880, 878268, 3297368, 12383528, 46541138, 175070668, 659220634, 2485025556, 9378589340, 35437315784, 134061346668, 507765754320, 1925456658954, 7309793143626, 27782162090527 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 6 of A188122

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..27

EXAMPLE

Some solutions for n=7

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

.-4...-6...-3...-4...-7..-10...-6...-9...-8...-5...-7...-6...-7...-9...-8...-7

.-1...-5...-2...-3...-6...-6...-1...-8...-4...-3...-6...-5...-5...-6...-4...-1

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

..3....5....1...-1....3....6....3....8....5....2....6....1....6....5....4....3

..4....8....5....6....8....7....4...10...10....6....9....9....7....8....7....7

..6...10...11...11...11...10....5...11...11....8...11...11...10...11....8....8

CROSSREFS

Sequence in context: A299412 A218080 A277609 * A239420 A219590 A260664

Adjacent sequences:  A188116 A188117 A188118 * A188120 A188121 A188122

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 21 2011

STATUS

approved

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Last modified November 28 01:24 EST 2021. Contains 349396 sequences. (Running on oeis4.)