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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A083578 a(n) = (6^n + (-4)^n)/2. 1
 1, 1, 26, 76, 776, 3376, 25376, 131776, 872576, 4907776, 30757376, 179301376, 1096779776, 6496792576, 39316299776, 234555621376, 1412702437376, 8454739787776, 50814338072576, 304542431051776, 1828628975845376 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS Table of n, a(n) for n=0..20. Index entries for linear recurrences with constant coefficients, signature (2,24). FORMULA a(n) = (6^n + (-4)^n)/2. G.f.: (1-x)/((1+4x)(1-6x)). E.g.f.: (exp(6x) + exp(-4x))/2. MATHEMATICA LinearRecurrence[{2, 24}, {1, 1}, 30] (* Harvey P. Dale, Nov 29 2017 *) CROSSREFS Cf. A083579. First differences of A051958. Sequence in context: A139698 A124719 A126380 * A173307 A042326 A042328 Adjacent sequences: A083575 A083576 A083577 * A083579 A083580 A083581 KEYWORD easy,nonn AUTHOR Paul Barry, Apr 30 2003 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.

Last modified September 26 08:10 EDT 2023. Contains 365654 sequences. (Running on oeis4.)