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!)
A200159 Number of -2..2 arrays x(0..n-1) of n elements with nonzero sum and with zero through n-1 differences all nonzero 0
4, 8, 34, 76, 276, 700, 2276, 5992, 18542, 50488, 151814, 420680, 1241580, 3481308, 10162686, 28707288, 83211126, 236138900, 681383716, 1939299184, 5579324890, 15908310224, 45678520824, 130391096068 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A200165

LINKS

Table of n, a(n) for n=1..24.

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Sequence in context: A149102 A149103 A039303 * A149104 A149105 A149106

Adjacent sequences:  A200156 A200157 A200158 * A200160 A200161 A200162

KEYWORD

nonn

AUTHOR

R. H. Hardin Nov 13 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 June 19 15:58 EDT 2021. Contains 345144 sequences. (Running on oeis4.)