cp's OEIS Frontend

A188121 Number of strictly increasing arrangements of n nonzero numbers in -(n+6)..(n+6) with sum zero.

%I A188121 #9 Jul 22 2025 11:00:29
%S A188121 0,8,32,167,740,3278,13994,58595,241250,982016,3959736,15848648,
%T A188121 63063260,249773862,985585668,3877333900,15216566840,59600223620,
%U A188121 233072224782,910286934007,3551576307448,13845532229952,53940983618522
%N A188121 Number of strictly increasing arrangements of n nonzero numbers in -(n+6)..(n+6) with sum zero.
%C A188121 Column 8 of A188122
%H A188121 R. H. Hardin, <a href="/A188121/b188121.txt">Table of n, a(n) for n = 1..25</a>
%e A188121 Some solutions for n=6
%e A188121 -12..-10..-10..-10..-12..-10..-10..-10..-10..-11...-5..-11..-12...-9..-12...-9
%e A188121 .-7...-6...-7...-6...-7...-7...-3...-8...-6...-7...-4..-10..-10...-8..-10...-5
%e A188121 .-1...-3...-2...-3....1...-3...-1...-1...-5...-4...-2...-7...-3...-6....2....1
%e A188121 ..2....4....1...-2....3....3....1....4....5....3....2....7....2....1....3....2
%e A188121 ..7....5....8....9....4....8....3....6....7....7....3...10...11...10....7....3
%e A188121 .11...10...10...12...11....9...10....9....9...12....6...11...12...12...10....8
%K A188121 nonn
%O A188121 1,2
%A A188121 _R. H. Hardin_ Mar 21 2011