

A187993


Number of nondecreasing arrangements of n numbers x(i) in (2n2)..(2n2) with the sum of sign(x(i))*x(i)^2 zero.


1



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



KEYWORD

nonn,more


AUTHOR



EXTENSIONS



STATUS

approved



