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%I #7 Oct 13 2021 00:54:49
%S 0,44,192,544,1340,2520,4620,7716,12500,18896,27876,38860,53492,71460,
%T 93972,121328,155180,194484,241980,296528,360804,434048,519528,614164,
%U 723528,845504,983924,1136840,1309496,1497332,1707736,1938160,2193024
%N Number of arrangements of 4 nonzero numbers x(i) in -n..n with the sum of trunc(x(i)/x(i+1)) equal to zero.
%C Row 3 of A189545.
%H R. H. Hardin, <a href="/A189547/b189547.txt">Table of n, a(n) for n = 1..200</a>
%e Some solutions for n=5
%e ..5...-1....5....1...-4...-1...-2...-3...-1....4....3....1....4....4...-1....1
%e .-2....2....3....1....3....4....5....2...-1...-3....2....1....3....4...-2...-2
%e .-1...-2....5....5...-5....3....2....5...-3...-4...-2...-1...-2...-4....3....2
%e .-5...-2...-4...-4...-4...-3...-1....4....3...-3...-4...-5...-3...-5....5....2
%Y Cf. A189545.
%K nonn
%O 1,2
%A _R. H. Hardin_ Apr 23 2011
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