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 A189503 Number of arrangements of 7 nonzero numbers x(i) in -n..n with the sum of floor(x(i)/x(i+1)) equal to zero 1

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

%S 40,1892,27508,182634,787412,2642358,7269852,17692662,38791846,

%T 78583484,149461616,269390980,462294730,765448244,1224516760,

%U 1898713570,2870678078,4243248920,6141093956,8731426052,12179866066,16758644852

%N Number of arrangements of 7 nonzero numbers x(i) in -n..n with the sum of floor(x(i)/x(i+1)) equal to zero

%C Row 6 of A189498

%H R. H. Hardin, <a href="/A189503/b189503.txt">Table of n, a(n) for n = 1..143</a>

%e Some solutions for n=5

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

%e .-5...-5...-4...-5...-5...-4...-5...-5...-4...-5...-4...-4...-5...-4...-4...-5

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

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Apr 23 2011

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