cp's OEIS Frontend

A188327 Number of nondecreasing arrangements of n nonzero numbers in -(n+1)..(n+1) with sum zero.

%I A188327 #7 Jul 22 2025 11:07:47
%S A188327 0,3,8,37,166,828,4238,22563,122986,684809,3877416,22270064,129457176,
%T A188327 760412390,4507076156,26926958097,162005104664,980816681009,
%U A188327 5971509956366,36540846282249,224628865150116,1386650559443616
%N A188327 Number of nondecreasing arrangements of n nonzero numbers in -(n+1)..(n+1) with sum zero.
%C A188327 Column 3 of A188333
%H A188327 R. H. Hardin, <a href="/A188327/b188327.txt">Table of n, a(n) for n = 1..30</a>
%e A188327 Some solutions for n=6
%e A188327 .-6...-4...-4...-6...-7...-7...-5...-7...-7...-7...-3...-7...-7...-5...-1...-7
%e A188327 .-4...-4...-3...-3...-2...-3...-4...-5...-1...-3...-2...-7...-2...-2...-1...-5
%e A188327 .-4...-3...-1...-1...-2...-2...-1...-2....1....1...-1...-1....1...-2...-1....1
%e A188327 ..2...-1...-1....2...-1....2....1....4....2....2...-1....3....2....3...-1....3
%e A188327 ..5....5....4....4....5....5....2....4....2....2....2....5....2....3....2....4
%e A188327 ..7....7....5....4....7....5....7....6....3....5....5....7....4....3....2....4
%K A188327 nonn
%O A188327 1,2
%A A188327 _R. H. Hardin_ Mar 28 2011