A188000 Number of nondecreasing arrangements of n numbers x(i) in -(n+5)..(n+5) with the sum of sign(x(i))*x(i)^2 zero

1, 8, 11, 75, 216, 1206, 5443, 30358, 160866, 907542, 5096859, 29196613, 168131646, 978358588, 5726901772, 33757032775, 200087891459, 119249818917, 7141550411892, 42964572899496, 25956521481379, 1574290540818422

Offset

1,2

Comments

Column 7 of A188002

Links

Table of n, a(n) for n=1..22.

Example

All solutions for n=3
.-4...-8...-5...-6...-4...-7...-2...-3...-5...-1....0
.-3....0....3....0....0....0....0....0....0....0....0
..5....8....4....6....4....7....2....3....5....1....0

Crossrefs

Sequence in context: A038289 A079607 A000787 * A167621 A289287 A006072

Adjacent sequences: A187997 A187998 A187999 * A188001 A188002 A188003

Keyword

nonn

Author

R. H. Hardin Mar 18 2011

Extensions

Terms from a(17) on by R. J. Mathar, May 10 2023

Status

approved