login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A189958 1/4 the number of arrangements of 9 nonzero numbers x(i) in -n..n with the sum of sign(x(i))*(|x(i)| mod x(i+1)) equal to zero 1

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

%S 128,17888,393006,4014514,23257218,101599137,346371666,1012894742,

%T 2594438857,6057314932,12928069327,26059247016,49402250718,

%U 89428018287,155225765626,260730899098,422939460592,669282239159,1030485287990

%N 1/4 the number of arrangements of 9 nonzero numbers x(i) in -n..n with the sum of sign(x(i))*(|x(i)| mod x(i+1)) equal to zero

%C Row 8 of A189951

%H R. H. Hardin, <a href="/A189958/b189958.txt">Table of n, a(n) for n = 1..48</a>

%e Some solutions with n=3

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

%e .-3...-3...-3...-3...-3...-3...-3...-3...-3...-3...-3...-3...-3...-3...-3...-3

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

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

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

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ May 02 2011

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 20 03:03 EDT 2024. Contains 371798 sequences. (Running on oeis4.)