cp's OEIS Frontend

A188120 Number of strictly increasing arrangements of n nonzero numbers in -(n+5)..(n+5) with sum zero.

%I A188120 #9 Jul 22 2025 11:00:22
%S A188120 0,7,24,118,482,1999,8044,32035,126122,493267,1918884,7436318,
%T A188120 28736532,110822456,426763772,1641751842,6311555602,24254371734,
%U A188120 93187581596,358022612486,1375631211812,5286588768343,20321901846262,78143777698585
%N A188120 Number of strictly increasing arrangements of n nonzero numbers in -(n+5)..(n+5) with sum zero.
%C A188120 Column 7 of A188122
%H A188120 R. H. Hardin, <a href="/A188120/b188120.txt">Table of n, a(n) for n = 1..26</a>
%e A188120 Some solutions for n=6
%e A188120 .-7..-10...-9...-6...-5..-11..-11..-11...-9...-6..-11...-7..-11...-8...-7...-8
%e A188120 .-4...-5...-7...-5...-3...-9...-7...-7...-6...-4...-5...-6...-6...-3...-4...-5
%e A188120 .-3...-3...-3...-4...-2...-5...-1...-5...-3...-1...-4...-2...-1...-2...-3...-1
%e A188120 ..3....3....2...-1...-1....7....2....4...-1....1....3...-1....3...-1....2....1
%e A188120 ..4....4....8....7....3....8....7....9....9....3....7....5....6....5....4....6
%e A188120 ..7...11....9....9....8...10...10...10...10....7...10...11....9....9....8....7
%K A188120 nonn
%O A188120 1,2
%A A188120 _R. H. Hardin_ Mar 21 2011