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A187997 Number of nondecreasing arrangements of n numbers x(i) in -(n+2)..(n+2) with the sum of sign(x(i))*x(i)^2 zero 0
1, 5, 8, 34, 88, 421, 1696, 8373, 40681, 211234, 1111148, 5987390, 32752144, 181900825, 1022304310, 5807285713 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 4 of A188002

LINKS

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

EXAMPLE

All solutions for n=3

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

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

..4....0....5....1....4....5....2....3

CROSSREFS

Sequence in context: A199396 A275003 A032790 * A188065 A204676 A219947

Adjacent sequences:  A187994 A187995 A187996 * A187998 A187999 A188000

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 18 2011

STATUS

approved

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Last modified November 26 17:47 EST 2021. Contains 349343 sequences. (Running on oeis4.)