%I #8 May 11 2023 08:22:04
%S 0,2,5,15,57,181,632,2199,7593,26706,93724,330555,1170088,4149361,
%T 14754670,52564714,187595025,670589799,2400467901,8603906865,
%U 30874479617,110907636467,398789645747,1435195800184,5169318396770,18633022691923,67210498566801,242590233305619,876138147816208,3166048659124955,11447024096561941,41407915745717488
%N Number of nondecreasing arrangements of n numbers x(i) in -n..n with the sum of sign(x(i))*2^|x(i)| zero
%C Column 2 of A187988
%e All solutions for n=3
%e .-1...-2...-3...-2...-1
%e ..0....1....2...-2...-1
%e ..0....1....2....3....2
%K nonn
%O 1,2
%A _R. H. Hardin_ Mar 18 2011
%E More terms from _R. J. Mathar_, May 11 2023