cp's OEIS Frontend

A189504 Number of arrangements of 8 nonzero numbers x(i) in -n..n with the sum of floor(x(i)/x(i+1)) equal to zero.

%I A189504 #7 Jul 22 2025 11:47:58
%S A189504 0,7384,152358,1350418,7250142,29261538,93830584,260746932,640437244,
%T A189504 1434950142,2985187290,5855131794,10847051914,19293465580,33015900952,
%U A189504 54518107984,87418596734,136633143572,208413957692,311534423834
%N A189504 Number of arrangements of 8 nonzero numbers x(i) in -n..n with the sum of floor(x(i)/x(i+1)) equal to zero.
%C A189504 Row 7 of A189498
%H A189504 R. H. Hardin, <a href="/A189504/b189504.txt">Table of n, a(n) for n = 1..90</a>
%e A189504 Some solutions for n=5
%e A189504 .-5...-4...-5...-5...-5...-5...-5...-4...-5...-5...-5...-4...-5...-5...-4...-5
%e A189504 .-5...-5...-5...-5...-5...-5...-5...-5...-5...-5...-5...-5...-5...-5...-5...-5
%e A189504 ..2...-4....5...-3...-4...-2...-3...-3...-5...-2...-4...-4....2...-2...-5...-5
%e A189504 .-4....4....5....3....5....3...-4...-4....1...-5....3....3....1...-4....2...-4
%e A189504 .-2...-5....3...-4....1...-5....2...-1....4....5....1....2....1...-2...-2...-4
%e A189504 ..4...-2....5....3...-1...-2....5....5....3...-3...-4...-1...-2....5...-1...-4
%e A189504 ..5....1...-5....3....4....1....4...-2....1....4....5...-5...-3...-5...-2....4
%e A189504 ..2....1....5....2...-1...-4...-4....5...-1....4...-5...-2...-5....2...-2...-1
%K A189504 nonn
%O A189504 1,2
%A A189504 _R. H. Hardin_ Apr 23 2011