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A187994 Number of nondecreasing arrangements of n numbers x(i) in -(n-1)..(n-1) with the sum of sign(x(i))*x(i)^2 zero 1
1, 2, 3, 12, 25, 106, 376, 1670, 7315, 35808, 176971, 910940, 4782220, 25663080, 139884020, 773939566, 4334475055, 24546800088, 140363450663, 809676156506, 4707204024505, 27561115755712, 162415358799242, 962751492786378, 5737779091829582 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Column 1 of A188002
LINKS
EXAMPLE
All solutions for n=3
.-1...-2....0
..0....0....0
..1....2....0
CROSSREFS
Sequence in context: A148068 A148069 A148070 * A016021 A173669 A136703
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 18 2011
EXTENSIONS
Terms from a(19) on by R. J. Mathar, May 10 2023
STATUS
approved

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Last modified March 28 04:13 EDT 2024. Contains 371235 sequences. (Running on oeis4.)