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A187999 Number of nondecreasing arrangements of n numbers x(i) in -(n+4)..(n+4) with the sum of sign(x(i))*x(i)^2 zero 0
1, 7, 10, 57, 159, 862, 3796, 20224, 105208, 573982, 3155734, 17684829, 100137017, 572950408, 3306528276, 19236540159 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 6 of A188002

LINKS

Table of n, a(n) for n=1..16.

EXAMPLE

All solutions for n=3

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

..0....0....0....0....0....0....3...-3....0....0

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

CROSSREFS

Sequence in context: A025632 A038276 A249952 * A097187 A115904 A136865

Adjacent sequences:  A187996 A187997 A187998 * A188000 A188001 A188002

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 18 2011

STATUS

approved

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Last modified January 27 13:45 EST 2022. Contains 350607 sequences. (Running on oeis4.)