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!)
A190073 Number of arrangements of 4 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
0, 40, 166, 483, 1126, 2276, 4150, 6946, 10909, 16353, 23728, 33290, 45591, 61100, 80161, 103121, 130833, 163649, 202441, 247746, 300269, 360694, 430361, 508989, 598090, 698534, 811133, 936287, 1075989, 1230312, 1401309, 1589246, 1795222 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Row 3 of A190071
LINKS
EXAMPLE
Some solutions for n=4
..4...-3...-3...-4....2...-4...-1...-1...-1...-4...-4....3....2....3...-2....1
.-4....3....3....1....3....3...-1....4....3...-3...-4....3...-1...-1...-4....4
..3....3....3....4...-2...-4...-3...-4....2....2...-4....2...-1...-4...-4...-3
..1...-4....4....1...-3...-3....2...-2....3....3....3...-1...-1...-3....3...-3
CROSSREFS
Sequence in context: A250987 A300963 A146762 * A250592 A250585 A260169
KEYWORD
nonn
AUTHOR
R. H. Hardin May 04 2011
STATUS
approved

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 March 28 14:38 EDT 2024. Contains 371254 sequences. (Running on oeis4.)