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A201810 Number of arrays of n integers in -7..7 with sum zero and equal numbers of elements greater than zero and less than zero 1
1, 15, 43, 1471, 7071, 207621, 1355145, 33222463, 266948431, 5714583505, 53305896645, 1032485634181, 10748736159253, 193347106894215, 2184638624782083, 37202261536824063, 447056372628222463 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 7 of A201811

LINKS

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

EXAMPLE

Some solutions for n=5

.-5....2...-3...-5...-3....2....4....1...-7....6....0....3....4....0...-2...-6

..1....3....0....5....2...-3....6...-4....0...-3....1...-4....0....7...-5....3

..0....0...-5...-4....6...-3....0....0....7....3...-2....0....6....1....3....0

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

..7...-1....3....0....0....0...-6....7...-2....0....2...-1...-3...-7....0...-2

CROSSREFS

Sequence in context: A193647 A133343 A027845 * A292018 A289669 A295980

Adjacent sequences:  A201807 A201808 A201809 * A201811 A201812 A201813

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 05 2011

STATUS

approved

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Last modified November 15 13:47 EST 2019. Contains 329149 sequences. (Running on oeis4.)