A188121 - OEIS

%I #7 Mar 31 2012 12:36:10

%S 0,8,32,167,740,3278,13994,58595,241250,982016,3959736,15848648,

%T 63063260,249773862,985585668,3877333900,15216566840,59600223620,

%U 233072224782,910286934007,3551576307448,13845532229952,53940983618522

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

%C Column 8 of A188122

%H R. H. Hardin, <a href="/A188121/b188121.txt">Table of n, a(n) for n = 1..25</a>

%e Some solutions for n=6

%e -12..-10..-10..-10..-12..-10..-10..-10..-10..-11...-5..-11..-12...-9..-12...-9

%e .-7...-6...-7...-6...-7...-7...-3...-8...-6...-7...-4..-10..-10...-8..-10...-5

%e .-1...-3...-2...-3....1...-3...-1...-1...-5...-4...-2...-7...-3...-6....2....1

%e ..2....4....1...-2....3....3....1....4....5....3....2....7....2....1....3....2

%e ..7....5....8....9....4....8....3....6....7....7....3...10...11...10....7....3

%e .11...10...10...12...11....9...10....9....9...12....6...11...12...12...10....8

%K nonn

%O 1,2

%A _R. H. Hardin_ Mar 21 2011