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A188204 Number of nondecreasing arrangements of n numbers in -(2n-2)..(2n-2) with sum zero.

%I A188204 #8 Jul 22 2025 11:02:22
%S A188204 1,3,13,86,649,5444,48417,450096,4323349,42611589,428774562,
%T A188204 4388708804,45566531999,478878888344,5085572069608,54500021186920,
%U A188204 588726212033973,6404580593674139,70112392484932177,771869051769933762
%N A188204 Number of nondecreasing arrangements of n numbers in -(2n-2)..(2n-2) with sum zero.
%C A188204 Diagonal of A188211
%H A188204 R. H. Hardin, <a href="/A188204/b188204.txt">Table of n, a(n) for n = 1..24</a>
%e A188204 All solutions for n=3
%e A188204 .-2....0...-2...-3...-1...-3...-4...-2...-4...-4...-3...-2...-1
%e A188204 ..0....0...-2...-1....0....0....0....1....1....2....1...-1...-1
%e A188204 ..2....0....4....4....1....3....4....1....3....2....2....3....2
%K A188204 nonn
%O A188204 1,2
%A A188204 _R. H. Hardin_ Mar 24 2011