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 A190075 Number of arrangements of 6 nonzero numbers x(i) in -n..n with the sum of div(x(i),x(i+1)), where div(a,b)=a/b produces the integer quotient implying a nonnegative remainder, equal to zero 1

%I #5 Mar 31 2012 12:36:19

%S 0,550,5136,25306,88509,249119,599181,1291797,2542771,4665542,8142317,

%T 13502963,21463807,33185295,49745019,72458535,103375585,144707600,

%U 199040665,269251217,358360590,471257436,613624162,789275327,1002980959

%N Number of arrangements of 6 nonzero numbers x(i) in -n..n with the sum of div(x(i),x(i+1)), where div(a,b)=a/b produces the integer quotient implying a nonnegative remainder, equal to zero

%C Row 5 of A190071

%H R. H. Hardin, <a href="/A190075/b190075.txt">Table of n, a(n) for n = 1..200</a>

%e Some solutions for n=4

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

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

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

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

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

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

%K nonn

%O 1,2

%A _R. H. Hardin_ May 04 2011

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Last modified June 5 11:42 EDT 2023. Contains 363136 sequences. (Running on oeis4.)