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A188113 Number of strictly increasing arrangements of n nonzero numbers in -(2n-2)..(2n-2) with sum zero 1
0, 2, 4, 31, 172, 1154, 8044, 58595, 439514, 3379972, 26513202, 211413199, 1709183316, 13981482114, 115537553904, 963234521237, 8093123460146, 68468543003422, 582819983344618, 4988538052577712, 42911585401063684 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A188122

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..32

EXAMPLE

Some solutions for n=6

-10...-9...-9...-8...-7...-7...-8...-8...-9...-9...-9..-10...-6...-7...-7...-8

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

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

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

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

.10....9....7....8...10....7...10...10...10...10...10....6....7....7....8....7

CROSSREFS

Sequence in context: A181620 A220283 A339603 * A259115 A051569 A087186

Adjacent sequences: A188110 A188111 A188112 * A188114 A188115 A188116

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 21 2011

STATUS

approved

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Last modified January 27 06:42 EST 2023. Contains 359837 sequences. (Running on oeis4.)