cp's OEIS Frontend

A188178 Number of strictly increasing arrangements of n numbers in -(n+4)..(n+4) with sum zero.

%I A188178 #7 Jul 22 2025 11:01:24
%S A188178 1,6,25,104,414,1636,6375,24591,94257,360002,1371535,5216252,19819846,
%T A188178 75277670,285893124,1085984406,4126777398,15690144942,59691687518,
%U A188178 227248928264,865788366806,3301087870766,12596381911969,48104063936789
%N A188178 Number of strictly increasing arrangements of n numbers in -(n+4)..(n+4) with sum zero.
%C A188178 Column 6 of A188181
%H A188178 R. H. Hardin, <a href="/A188178/b188178.txt">Table of n, a(n) for n = 1..27</a>
%e A188178 Some solutions for n=5
%e A188178 .-7...-4...-9...-9...-8...-8...-6...-6...-7...-5...-7...-9...-5...-9...-9...-5
%e A188178 .-5...-2...-2...-6...-4...-6...-4...-5...-6...-3...-4...-1...-3...-5...-5...-4
%e A188178 ..0....0....2....3....1...-3...-2....0....0...-1...-3....0....0....2...-2....0
%e A188178 ..5....1....4....5....2....8....4....3....5....4....6....3....3....4....7....4
%e A188178 ..7....5....5....7....9....9....8....8....8....5....8....7....5....8....9....5
%K A188178 nonn
%O A188178 1,2
%A A188178 _R. H. Hardin_ Mar 23 2011