A187993 - OEIS

A187993

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

1, 3, 5, 34, 117, 862, 5443, 43750, 354103, 3099873, 27848450, 258912232, 2459308291, 23849609290, 235048481924

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OFFSET

1,2

LINKS

EXAMPLE

All solutions for n=3

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

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

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

CROSSREFS

Diagonal of A188002.

KEYWORD

nonn,more

AUTHOR

R. H. Hardin, Mar 18 2011

EXTENSIONS

Terms from a(14) on by R. J. Mathar, May 10 2023

STATUS

approved