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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A190064 Number of arrangements of n+1 nonzero numbers x(i) in -2..2 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
 2, 12, 40, 144, 550, 1896, 7584, 27328, 105348, 398760, 1538696, 5872800, 22646862, 87492676, 339055650, 1313842904, 5104724558, 19873572892, 77470783406, 302258087616, 1180840902336, 4618922848536, 18083348822516, 70852652846320 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 2 of A190071 LINKS R. H. Hardin, Table of n, a(n) for n = 1..200 EXAMPLE Some solutions for n=4 .-2...-1...-1...-2...-2....1....2...-1...-1....2...-2....1....2....2....1....1 .-2....1....1...-1...-1...-1....1....1...-2...-1....1....1...-1....2...-2....1 ..2....1...-2....1....1...-1....2....2....1...-2....1....2....2....2....1....1 .-2...-1....2....2...-2....2...-2...-2....1....2....1...-1....1...-2....2...-1 .-2...-2....1...-2....2....2....2...-1....2....1....2...-1....1....2....1....1 CROSSREFS Sequence in context: A013194 A212874 A074447 * A240122 A110953 A003683 Adjacent sequences: A190061 A190062 A190063 * A190065 A190066 A190067 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.

Last modified October 4 01:05 EDT 2023. Contains 365872 sequences. (Running on oeis4.)