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 A189549 Number of arrangements of 6 nonzero numbers x(i) in -n..n with the sum of trunc(x(i)/x(i+1)) equal to zero 1

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

%S 0,552,5416,26804,97836,274132,683144,1481908,2937048,5414876,9605792,

%T 15831096,25469448,39609448,59492044,86819652,124912364,174698948,

%U 241615316,327281004,436632904,575430892,752423588,965700832,1230962864

%N Number of arrangements of 6 nonzero numbers x(i) in -n..n with the sum of trunc(x(i)/x(i+1)) equal to zero

%C Row 5 of A189545

%H R. H. Hardin, <a href="/A189549/b189549.txt">Table of n, a(n) for n = 1..200</a>

%e Some solutions for n=5

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

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

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

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

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

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

%K nonn

%O 1,2

%A _R. H. Hardin_ Apr 23 2011

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Last modified August 7 08:03 EDT 2024. Contains 375008 sequences. (Running on oeis4.)