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Number of nondecreasing arrangements of n numbers x(i) in -(n+4)..(n+4) with the sum of sign(x(i))*2^|x(i)| zero
1

%I #9 May 17 2023 05:06:11

%S 0,6,13,49,181,597,2166,7592,26835,95590,339475,1211024,4324913,

%T 15465952,55398468,198646230,713134270,2562757415,9218114300,

%U 33185957425,119566240848,431102833455,1555423251527,5615525795887,20285623430206,73320521305274,265147098624058,959309368316993,3472389521265649

%N Number of nondecreasing arrangements of n numbers x(i) in -(n+4)..(n+4) with the sum of sign(x(i))*2^|x(i)| zero

%C Column 6 of A187988

%e All solutions for n=3

%e .-7...-5...-2...-4...-3...-6...-2...-3...-1...-1...-6...-5...-4

%e ..6....4...-2...-4...-3...-6....1....2...-1....0....5...-5....3

%e ..6....4....3....5....4....7....1....2....2....0....5....6....3

%K nonn

%O 1,2

%A _R. H. Hardin_ Mar 18 2011

%E Terms from a(14) on from _R. J. Mathar_, May 17 2023