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A188114 Number of strictly increasing arrangements of n nonzero numbers in -(n-1)..(n-1) with sum zero 2
0, 1, 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

1,4

COMMENTS

Column 1 of A188122

LINKS

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

EXAMPLE

All solutions for n=6

.-5...-5...-5...-4...-4...-5...-3...-5...-4...-4...-5...-4...-5...-5...-5...-5

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

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

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

..3....4....4....3....2....3....2....3....2....3....3....3....3....2....4....4

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

CROSSREFS

Equals A188116(n-2)

Sequence in context: A330693 A329541 A154736 * A188116 A300316 A329546

Adjacent sequences:  A188111 A188112 A188113 * A188115 A188116 A188117

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.)