Logo

Greetings from The On-Line Encyclopedia of Integer Sequences!

Hints

Search: id:A135019
Displaying 1-1 of 1 results found. page 1
     Format: long | short | internal | text      Sort: relevance | references | number      Highlight: on | off
A135019 a(n)=-a(n-1)+2a(n-2)-a(n-3). +0
1
0, 1, -3, 5, -12, 25, -54, 116, -249, 535, -1149, 2468, -5301, 11386, -24456, 52529, -112827, 242341, -520524, 1118033, -2401422, 5158012, -11078889, 23796335, -51112125, 109783684, -235804269, 506483762, -1087875984, 2336647777 (list; graph; listen)
OFFSET

0,3

FORMULA

Sequence is identical to its signed second differences less first 3 terms.

a(n)*(-1)^(n+1) = A002478(n-1)+2*A002478(n-2). G.f.: -x*(-1+2*x)/(1+x-2*x^2+x^3). [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), May 17 2009]

CROSSREFS

Sequence in context: A151524 A030270 A129757 this_sequence A141685 A017921 A161762

Adjacent sequences: A135016 A135017 A135018 this_sequence A135020 A135021 A135022

KEYWORD

sign

AUTHOR

Paul Curtz (bpcrtz(AT)free.fr), Feb 10 2008

EXTENSIONS

More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), May 17 2009

page 1

Search completed in 0.002 seconds

Lookup | Welcome | Find friends | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
More pages | Superseeker | Maintained by N. J. A. Sloane (njas@research.att.com)

Last modified December 17 23:40 EST 2009. Contains 171025 sequences.


AT&T Labs Research