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!)
A134813 a(n) = b(n+1)-2b(n) where b() is A134812. 2
1, -3, 3, 0, -6, 12, -12, 0, 24, -48, 48, 0, -96, 192, -192, 0, 384, -768, 768, 0, -1536, 3072, -3072, 0, 6144, -12288, 12288, 0, -24576, 49152, -49152, 0, 98304, -196608, 196608, 0, -393216, 786432, -786432, 0, 1572864, -3145728, 3145728, 0, -6291456 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..44.

Index entries for linear recurrences with constant coefficients, signature (-2,-2)

FORMULA

G.f. 1 -3*x*(1+x) / ( 1+2*x+2*x^2 ). - R. J. Mathar, Aug 11 2012

a(n) = -3*A009116(n-1), n>0. - R. J. Mathar, Aug 11 2012

MATHEMATICA

LinearRecurrence[{-2, -2}, {1, -3, 3}, 50] (* Harvey P. Dale, Mar 22 2018 *)

CROSSREFS

Cf. A003945.

Sequence in context: A117234 A122831 A019701 * A338037 A164107 A093755

Adjacent sequences:  A134810 A134811 A134812 * A134814 A134815 A134816

KEYWORD

sign

AUTHOR

Paul Curtz, Jan 28 2008

EXTENSIONS

More terms from Harvey P. Dale, Mar 22 2018

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 20 03:04 EDT 2021. Contains 348099 sequences. (Running on oeis4.)