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A201809 Number of arrays of n integers in -6..6 with sum zero and equal numbers of elements greater than zero and less than zero 1
1, 13, 37, 949, 4501, 99961, 637393, 12004357, 93039589, 1554288913, 13794790153, 211729119889, 2069010499921, 29916152015413, 313278539674477, 4343800080821797, 47825160489621541, 643987273822751329 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 6 of A201811

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

EXAMPLE

Some solutions for n=6

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

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

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

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

.-6....0....1....0....2....6....1...-4....6...-2...-5...-1...-4....4...-2....4

..3....0....1...-4....3...-5....5....1....3...-4...-1....5....4...-4....6...-3

CROSSREFS

Sequence in context: A195540 A262475 A309808 * A129541 A302858 A244185

Adjacent sequences: A201806 A201807 A201808 * A201810 A201811 A201812

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 05 2011

STATUS

approved

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Last modified February 2 18:34 EST 2023. Contains 360023 sequences. (Running on oeis4.)