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A187995 Number of nondecreasing arrangements of n numbers x(i) in -n..n with the sum of sign(x(i))*x(i)^2 zero 0
1, 3, 4, 17, 45, 176, 644, 2983, 13675, 67487, 340192, 1775300, 9438436, 51112686, 281006680, 1565898705, 8826775421 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 2 of A188002

LINKS

Table of n, a(n) for n=1..17.

EXAMPLE

All solutions for n=3

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

..0....0....0....0

..3....2....1....0

CROSSREFS

Sequence in context: A096876 A257330 A115388 * A296277 A303480 A254200

Adjacent sequences:  A187992 A187993 A187994 * A187996 A187997 A187998

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 18 2011

STATUS

approved

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Last modified October 19 22:05 EDT 2021. Contains 348095 sequences. (Running on oeis4.)