A188118 - OEIS

A188118

Number of strictly increasing arrangements of n nonzero numbers in -(n+3)..(n+3) with sum zero

0, 5, 12, 51, 172, 624, 2216, 7970, 28660, 103599, 375854, 1368883, 5003340, 18351050, 67525962, 249235562, 922567826, 3424217898, 12741735980, 47526320684, 177671217830, 665611279282, 2498575823284, 9396889413586

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OFFSET

1,2

COMMENTS

Column 5 of A188122

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..28

EXAMPLE

Some solutions for n=6

.-7...-8...-7...-9...-8...-9...-9...-9...-9...-8...-8...-8...-9...-9...-7...-8

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

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

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

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

..8....8....9....9....9....8....8....5....9....9....9....5....9....9....8....8

CROSSREFS

Sequence in context: A135769 A074024 A054661 * A062978 A189421 A066961

Adjacent sequences: A188115 A188116 A188117 * A188119 A188120 A188121

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 21 2011

STATUS

approved