login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A200546 Number of -1..1 arrays x(0..n+1) of n+2 elements with zero sum and nonzero second differences 1
4, 14, 26, 72, 142, 362, 778, 1938, 4366, 10628, 24532, 59138, 138680, 333014, 788374, 1890870, 4503208, 10803262, 25831504, 62025512, 148725902, 357516682, 859055042, 2067463940, 4975921904, 11988835382, 28892947100, 69685951942 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A200553

LINKS

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

EXAMPLE

Some solutions for n=3

..0....1...-1...-1...-1....0....1...-1....1....0....1....0...-1....1....0....1

.-1....1...-1....1....1...-1....1....1...-1....1....0...-1....0...-1....1...-1

.-1...-1....1...-1....0....1...-1....1....0...-1....1....1....0....1...-1...-1

..1....0....0....1....1....1...-1...-1...-1...-1...-1....0....1...-1....1....1

..1...-1....1....0...-1...-1....0....0....1....1...-1....0....0....0...-1....0

CROSSREFS

Sequence in context: A030572 A175680 A094320 * A304342 A066907 A130439

Adjacent sequences:  A200543 A200544 A200545 * A200547 A200548 A200549

KEYWORD

nonn

AUTHOR

R. H. Hardin Nov 19 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 | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified August 8 11:31 EDT 2020. Contains 336298 sequences. (Running on oeis4.)