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A187998
Number of nondecreasing arrangements of n numbers x(i) in -(n+3)..(n+3) with the sum of sign(x(i))*x(i)^2 zero.
1
1, 6, 9, 46, 117, 636, 2596, 13343, 66452, 354806, 1898800, 10452050, 58080269, 327389928, 1863061322, 10707246833, 62028855007, 362078074528, 2127680924575, 12580327500008, 74800656700824, 447053889525102, 2684568476124840, 16191874238303244
OFFSET
1,2
COMMENTS
Column 5 of A188002.
EXAMPLE
All solutions for n=3
..0...-1...-2...-4...-4...-5...-3...-5...-6
..0....0....0....0...-3....0....0....3....0
..0....1....2....4....5....5....3....4....6
CROSSREFS
Cf. A188002.
Sequence in context: A154139 A330983 A299914 * A177181 A126110 A372499
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 18 2011
EXTENSIONS
Terms from a(17) on by R. J. Mathar, May 10 2023
STATUS
approved