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!)
A189538 Number of arrangements of n+1 nonzero numbers x(i) in -2..2 with the sum of trunc(x(i)/x(i+1)) equal to zero 1
4, 8, 44, 152, 552, 2000, 7628, 28440, 108792, 411888, 1586424, 6066032, 23474384, 90378912, 351072012, 1358520600, 5293045208, 20561697200, 80309986856, 312934745552, 1224770426672, 4784290151264, 18757260263352, 73421632108656 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A189545

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..200

EXAMPLE

Some solutions for n=5

.-2....2....1...-2...-1....2...-1....2...-1...-1...-2...-2...-1...-1....2....2

..1...-2...-1...-1...-1...-1...-2...-1....1....2....2....2....1....2....2...-1

..2....2...-2....1....1...-1...-2....2...-2...-1...-1...-2....1...-1...-2....1

.-2....2....2...-1...-1...-1...-2....1...-1...-2...-1...-2...-1...-1...-2....1

.-2...-2....1....1...-2....1....1....1....1...-2...-1...-1...-1...-1...-2...-2

.-1...-1...-2....1...-2....1...-2...-1...-2...-2...-1....1...-2...-2....1...-1

CROSSREFS

Sequence in context: A045639 A337782 A285751 * A351071 A270352 A183394

Adjacent sequences:  A189535 A189536 A189537 * A189539 A189540 A189541

KEYWORD

nonn

AUTHOR

R. H. Hardin Apr 23 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 May 19 18:35 EDT 2022. Contains 353847 sequences. (Running on oeis4.)