%I #8 May 11 2023 08:24:12
%S 0,3,7,22,82,260,912,3158,10920,38385,134652,474953,1680801,5960094,
%T 21192029,75492493,269409262,963003740,3447075784,12354841859,
%U 44333177653,159250306113,572602762173,2060689223094,7422109110741,26752896159623,96498088175421,348296867524920,1257893866073062,4545530514677703,16434464166065112
%N Number of nondecreasing arrangements of n numbers x(i) in -(n+1)..(n+1) with the sum of sign(x(i))*2^|x(i)| zero
%C Column 3 of A187988
%e Some solutions for n=4
%e .-5...-3...-5...-4...-4...-4...-5...-4...-5...-4...-3...-3...-2...-3...-2...-5
%e .-5...-2...-2...-4...-3...-3...-4...-1...-1....2....1...-1...-1...-2....0...-3
%e ..5...-2....2....4....3...-3....4....1....1....2....1....1....1....2....0....3
%e ..5....4....5....4....4....5....5....4....5....3....2....3....2....3....1....5
%K nonn
%O 1,2
%A _R. H. Hardin_ Mar 18 2011
%E More terms from _R. J. Mathar_, May 11 2023