A188180 - OEIS

%I #5 Mar 31 2012 12:36:11

%S 1,8,41,207,967,4370,19138,81805,343363,1421530,5820904,23626234,

%T 95220378,381577586,1521967986,6047272980,23951790860,94618944122,

%U 372969633775,1467518524851,5765549295661,22623246705372,88678543148354

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

%C Column 8 of A188181

%H R. H. Hardin, <a href="/A188180/b188180.txt">Table of n, a(n) for n = 1..25</a>

%e Some solutions for n=5

%e .-5...-7...-6...-9..-11...-8...-9...-8...-9..-10...-6..-10...-6...-8...-6...-8

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

%e .-1...-3....1....0...-1....4....2...-2...-5....0...-2....2...-2....0....0....0

%e ..3....5....3....6....7....5....3....7....9....6....3....4....4....4....1....1

%e ..5...11....5....8....8....6....6...10...11...11...10....8....8...11....6....8

%K nonn

%O 1,2

%A _R. H. Hardin_ Mar 23 2011