login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A189505 Number of arrangements of 9 nonzero numbers x(i) in -n..n with the sum of floor(x(i)/x(i+1)) equal to zero 1

%I

%S 140,26816,852940,10077438,67449574,326423068,1218634086,3870426602,

%T 10678039872,26541186546,60515390904,129217908546,258501393812,

%U 493822993858,903540678414,1589111278140,2702453254684,4467233004764

%N Number of arrangements of 9 nonzero numbers x(i) in -n..n with the sum of floor(x(i)/x(i+1)) equal to zero

%C Row 8 of A189498

%H R. H. Hardin, <a href="/A189505/b189505.txt">Table of n, a(n) for n = 1..58</a>

%e Some solutions for n=5

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

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

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

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

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

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Apr 23 2011

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified November 12 19:41 EST 2019. Contains 329078 sequences. (Running on oeis4.)