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!)
A200180 Number of -7..7 arrays x(0..n-1) of n elements with zero sum and no two consecutive declines, no adjacent equal elements, and no element more than one greater than the previous (random base sawtooth pattern) 1
1, 7, 9, 31, 53, 141, 380, 1010, 2152, 5014, 14018, 35542, 78385, 188789, 503051, 1241939, 2859687, 6957672, 17863397, 43991846, 103888178, 253531752, 640390692, 1575397895, 3777406958, 9259136398, 23167497450, 57008137128, 138220165963 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 7 of A200181

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..110

EXAMPLE

Some solutions for n=6

..3....6....7....2....3....4....1....2....6....2....5....2....6....4....5....2

.-1....5....2....3...-1....0....2....3....2....3...-1....0....0....2....6....0

..0....6....3....4....0....1....3....4....3....4....0....1....1....3...-3....1

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

..0...-5...-3...-2....2...-1....1...-3...-2...-1....2...-3....0...-1...-1....1

.-1...-6...-5...-4...-5...-2...-7...-2...-6...-6...-7...-2...-6...-6...-5...-4

CROSSREFS

Sequence in context: A309199 A186234 A085903 * A147248 A147186 A131623

Adjacent sequences:  A200177 A200178 A200179 * A200181 A200182 A200183

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 March 28 14:58 EDT 2020. Contains 333089 sequences. (Running on oeis4.)