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!)
A134812 a(n) = 2a(n-2) + 4a(n-3), n >= 3. 2
0, 1, -1, 1, 2, -2, 8, 4, 8, 40, 32, 112, 224, 352, 896, 1600, 3200, 6784, 12800, 26368, 52736, 103936, 210944, 418816, 837632, 1681408, 3350528, 6713344, 13426688, 26828800, 53706752, 107364352, 214728704, 429555712, 858914816, 1718026240, 3436052480, 6871711744, 13744209920 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,5

LINKS

Joshua Zucker, Feb 23 2008, Table of n, a(n) for n = 0..60

Index entries for linear recurrences with constant coefficients, signature (0,2,4).

FORMULA

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

20*a(n) = 2^n - 6*A078069(n), n>0. - R. J. Mathar, Aug 11 2012

CROSSREFS

Cf. A134654.

Sequence in context: A331333 A120399 A144816 * A144847 A143625 A003612

Adjacent sequences:  A134809 A134810 A134811 * A134813 A134814 A134815

KEYWORD

sign,easy

AUTHOR

Paul Curtz, Jan 28 2008

EXTENSIONS

More terms from Joshua Zucker, Feb 23 2008

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.)