login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A200453 Number of -7..7 arrays x(0..n+1) of n+2 elements with zero sum and nonzero first and second differences. 1
142, 1832, 22276, 278906, 3513884, 44716536, 572857272, 7380022092, 95496980144, 1240352594210, 16161267003100, 211148128583658, 2765181621011902, 36287540439791446, 477071904597059874, 6282247056373911518 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 of A200454.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..97

EXAMPLE

Some solutions for n=3

.-1...-4....0....7....5....5....6...-4....2....0...-1...-5....4....2...-6...-6

.-3....3....2....0...-1....2...-2....6....3....4....2....6...-5....3...-1....7

..4....4...-5...-1...-2...-6...-4....4...-5...-1...-3....1....1...-4....1...-6

.-5...-3....3...-4...-4...-4...-7....0...-1...-4....4...-5...-3....3....6....2

..5....0....0...-2....2....3....7...-6....1....1...-2....3....3...-4....0....3

CROSSREFS

Sequence in context: A092230 A259422 A219146 * A283638 A235457 A200557

Adjacent sequences:  A200450 A200451 A200452 * A200454 A200455 A200456

KEYWORD

nonn

AUTHOR

R. H. Hardin Nov 18 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 | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified May 18 18:42 EDT 2022. Contains 353824 sequences. (Running on oeis4.)