login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A199526 Number of -4..4 arrays x(0..n-1) of n elements with zero sum and no two consecutive zero elements 1
1, 8, 60, 464, 3734, 30484, 252154, 2105064, 17701326, 149708146, 1272108368, 10851700690, 92875809416, 797134845184, 6858361265978, 59133629878796, 510815878314050, 4419961056157870, 38301854208088068, 332355738077962284 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 4 of A199530

LINKS

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

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Sequence in context: A254658 A228514 A233666 * A129331 A005990 A160228

Adjacent sequences:  A199523 A199524 A199525 * A199527 A199528 A199529

KEYWORD

nonn

AUTHOR

R. H. Hardin Nov 07 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 October 22 00:52 EDT 2019. Contains 328315 sequences. (Running on oeis4.)