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!)
A183943 Number of strings of n numbers x(i) in -8..8 with sums of x(i) and of x(i)*x(i+1) both zero 0
1, 1, 17, 69, 1417, 9335, 135793, 1639099, 23586625, 323498939, 4919390397, 73971159473, 1157160667507 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Column 8 of A183944

LINKS

Table of n, a(n) for n=1..13.

EXAMPLE

Some solutions for n=4

..3....6....3...-4....7...-2...-3...-8....0...-4....8....2....5...-2....0....0

..0....0....6....0....0....0....0....2....7....1....0....0....0...-4....8...-3

..0...-6...-6....0...-7....2....3....4....0....2...-8....0...-5...-2....0....0

.-3....0...-3....4....0....0....0....2...-7....1....0...-2....0....8...-8....3

CROSSREFS

Sequence in context: A041556 A041558 A327495 * A180532 A179038 A179039

Adjacent sequences:  A183940 A183941 A183942 * A183944 A183945 A183946

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 08 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 May 10 21:08 EDT 2021. Contains 343780 sequences. (Running on oeis4.)