cp's OEIS Frontend

A188206 Number of nondecreasing arrangements of n numbers in -(n+2)..(n+2) with sum zero.

%I A188206 #7 Jul 22 2025 11:02:37
%S A188206 1,5,18,86,414,2137,11322,61731,343363,1943488,11157558,64841876,
%T A188206 380777798,2256500525,13479035412,81085573679,490856939495,
%U A188206 2988208167015,18283978901128,112390059830932,693750864437218,4298745830972544
%N A188206 Number of nondecreasing arrangements of n numbers in -(n+2)..(n+2) with sum zero.
%C A188206 Column 4 of A188211
%H A188206 R. H. Hardin, <a href="/A188206/b188206.txt">Table of n, a(n) for n = 1..29</a>
%e A188206 Some solutions for n=3
%e A188206 .-5...-3...-2...-5...-4...-3...-2...-2...-3...-5...-4...-3...-2....0...-4...-4
%e A188206 ..0...-1....1....1...-1....0...-2....0...-2....2....0....1...-1....0....2....1
%e A188206 ..5....4....1....4....5....3....4....2....5....3....4....2....3....0....2....3
%K A188206 nonn
%O A188206 1,2
%A A188206 _R. H. Hardin_ Mar 24 2011