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A188177 Number of strictly increasing arrangements of n numbers in -(n+3)..(n+3) with sum zero 1
1, 5, 18, 69, 252, 920, 3370, 12346, 45207, 165821, 609734, 2247151, 8300708, 30734578, 114067100, 424306230, 1581788460, 5909243454, 22120325320, 82963636468, 311732564498, 1173377033602, 4424032482238, 16706682557212 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 5 of A188181

LINKS

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

EXAMPLE

Some solutions for n=6

.-8...-8...-9...-8...-9...-8...-9...-6...-9...-8...-4...-9...-4...-9...-8...-8

.-4...-7...-1...-3...-2...-7...-3...-2...-3...-7...-3...-8...-3...-6...-5...-3

.-3...-1....0...-2....0...-4...-2...-1...-1...-3...-2....0...-2....1...-3...-1

.-1....4....1....0....1....2....2....0....3....2....2....3...-1....3....0....0

..7....5....3....5....2....8....5....1....4....7....3....6....3....5....7....5

..9....7....6....8....8....9....7....8....6....9....4....8....7....6....9....7

CROSSREFS

Sequence in context: A109438 A164051 A134764 * A343490 A302077 A322773

Adjacent sequences:  A188174 A188175 A188176 * A188178 A188179 A188180

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 23 2011

STATUS

approved

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Last modified May 18 16:07 EDT 2021. Contains 343995 sequences. (Running on oeis4.)