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A189540 Number of arrangements of n+1 nonzero numbers x(i) in -4..4 with the sum of trunc(x(i)/x(i+1)) equal to zero 1

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

%S 24,72,544,3664,26804,204544,1526520,11544464,87396896,665272176,

%T 5096651048,39149596736,301739941644,2331728722640,18056185672312,

%U 140109131577968,1089078310071600,8478661335953200,66101375005684576

%N Number of arrangements of n+1 nonzero numbers x(i) in -4..4 with the sum of trunc(x(i)/x(i+1)) equal to zero

%C Column 4 of A189545

%H R. H. Hardin, <a href="/A189540/b189540.txt">Table of n, a(n) for n = 1..200</a>

%e Some solutions for n=5

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

%e ..2...-2...-1...-3...-3...-1...-1...-2...-1....3....2...-2...-1....3...-2....1

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Apr 23 2011

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Last modified March 28 05:39 EDT 2024. Contains 371235 sequences. (Running on oeis4.)