A189496 - OEIS

%I #5 Mar 31 2012 12:36:15

%S 42,380,3850,45892,567774,7269852,93830584,1218634086,15936391068,

%T 209537582772,2767610804790,36693616556076,488053206844182,

%U 6509219419657784,87019925011505106,1165759230193567534

%N Number of arrangements of n+1 nonzero numbers x(i) in -7..7 with the sum of floor(x(i)/x(i+1)) equal to zero

%C Column 7 of A189498

%H R. H. Hardin, <a href="/A189496/b189496.txt">Table of n, a(n) for n = 1..85</a>

%e Some solutions for n=5

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

%e .-7...-7....2...-6....2...-6...-6...-6...-6...-6...-6...-6...-6...-7...-6...-6

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Apr 23 2011