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A188174 Number of strictly increasing arrangements of n numbers in -(2n-2)..(2n-2) with sum zero 1
1, 2, 8, 43, 252, 1636, 11322, 81805, 610358, 4672836, 36525052, 290399543, 2342043630, 19118822650, 157709971144, 1312796873451, 11015236989702, 93078467831012, 791462018168032, 6767910089071288, 58167781282121262 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A188181

LINKS

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

EXAMPLE

Some solutions for n=5

.-8...-7...-4...-6...-6...-7...-8...-8...-5...-5...-7...-6...-5...-7...-4...-7

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

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

..7....4....2....6....3....3....1....5....0....1....4....3....3....3....3....2

..8....6....4....8....7....5....8....7....8....7....8....8....6....5....5....8

CROSSREFS

Sequence in context: A267619 A012917 A050637 * A193659 A020023 A027836

Adjacent sequences:  A188171 A188172 A188173 * A188175 A188176 A188177

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 23 2011

STATUS

approved

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Last modified September 28 01:20 EDT 2020. Contains 337388 sequences. (Running on oeis4.)