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!)
A200188 Number of -4..4 arrays x(0..n-1) of n elements with zero sum, adjacent elements differing by more than one, and elements alternately increasing and decreasing 1
1, 8, 28, 120, 506, 2240, 9856, 44562, 199932, 914676, 4152696, 19143782, 87622590, 406118090, 1869888346, 8701509206, 40245967276, 187867050760, 872020225984, 4080661245080, 18995817588580, 89071683414448, 415623180115020 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 4 of A200192

LINKS

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

EXAMPLE

Some solutions for n=5

..1....2....1...-1....4....0...-2...-1....0...-4...-2....0....3....4....0....2

..4...-1...-4....4...-3....4....2...-3....3....3...-4...-3...-4...-4...-4...-2

.-3....2....2...-2....4...-2...-3....4...-2....1....3....2....4....0....3....2

..1...-3...-1....3...-4....1....4...-1....2....3....0...-1...-3...-3...-2...-2

.-3....0....2...-4...-1...-3...-1....1...-3...-3....3....2....0....3....3....0

CROSSREFS

Sequence in context: A295914 A054857 A241893 * A255276 A110046 A027380

Adjacent sequences:  A200185 A200186 A200187 * A200189 A200190 A200191

KEYWORD

nonn

AUTHOR

R. H. Hardin Nov 14 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 July 10 13:04 EDT 2020. Contains 335576 sequences. (Running on oeis4.)