A189490 - OEIS

%I #6 Mar 31 2012 12:36:15

%S 0,12,152,3388,85480,2642358,93830584,3870426602,179336321514,

%T 9289851475820,529329739784248,33294638055400354,2251636269472534394,

%U 165280305640591105462,13029806159083867494110,1097830097296833990293942

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

%C Diagonal of A189498

%H R. H. Hardin, <a href="/A189490/b189490.txt">Table of n, a(n) for n = 1..21</a>

%e Some solutions for n=5

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

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

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

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

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

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

%K nonn

%O 1,2

%A _R. H. Hardin_ Apr 23 2011