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A188116 Number of strictly increasing arrangements of n nonzero numbers in -(n+1)..(n+1) with sum zero 2
0, 3, 4, 16, 42, 137, 426, 1398, 4622, 15594, 53252, 184060, 642392, 2261829, 8024726, 28664946, 103015222, 372234190, 1351655526, 4930080182, 18055480464, 66371559466, 244817099870, 905883648170, 3361795172242, 12509691344838 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 3 of A188122

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..30

EXAMPLE

Some solutions for n=6

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

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

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

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

..3....5....5....5....4....4....3....4....4....4....6....5....4....3....5....5

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

CROSSREFS

Equals A188114(n+2)

Sequence in context: A329541 A154736 A188114 * A300316 A329546 A057542

Adjacent sequences:  A188113 A188114 A188115 * A188117 A188118 A188119

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 21 2011

STATUS

approved

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Last modified October 15 21:38 EDT 2021. Contains 348034 sequences. (Running on oeis4.)