cp's OEIS Frontend

A188328 Number of nondecreasing arrangements of n nonzero numbers in -(n+2)..(n+2) with sum zero.

%I A188328 #7 Jul 22 2025 11:07:54
%S A188328 0,4,12,61,288,1488,7836,42593,236130,1333130,7636298,44294040,
%T A188328 259682196,1536666930,9167492664,55086510571,333133752902,
%U A188328 2026193778596,12387543671686,76088580071361,469354099705916,2906492292139022
%N A188328 Number of nondecreasing arrangements of n nonzero numbers in -(n+2)..(n+2) with sum zero.
%C A188328 Column 4 of A188333
%H A188328 R. H. Hardin, <a href="/A188328/b188328.txt">Table of n, a(n) for n = 1..29</a>
%e A188328 Some solutions for n=6
%e A188328 .-8...-8...-8...-6...-5...-7...-4...-7...-5...-7...-8...-5...-4...-3...-5...-6
%e A188328 .-8...-5...-7...-4...-4...-7...-3...-5...-5...-4...-6...-2...-4...-2...-5...-6
%e A188328 .-2...-5...-1...-4...-4....1...-1...-5...-4...-3...-2....1...-3...-2...-5...-4
%e A188328 ..3....5....4....2...-1....1...-1....4....1....4....3....1....1...-2....4....4
%e A188328 ..7....5....4....4....7....5....1....6....5....4....5....1....5....4....4....4
%e A188328 ..8....8....8....8....7....7....8....7....8....6....8....4....5....5....7....8
%K A188328 nonn
%O A188328 1,2
%A A188328 _R. H. Hardin_ Mar 28 2011