The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A128797 (n^2-n)*3^n. 1
 0, 0, 18, 162, 972, 4860, 21870, 91854, 367416, 1417176, 5314410, 19486170, 70150212, 248714388, 870500358, 3013270470, 10331213040, 35126124336, 118550669634, 397493421714, 1324978072380, 4393348345260, 14498049539358 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS Vincenzo Librandi, Table of n, a(n) for n = 0..1000 Index entries for linear recurrences with constant coefficients, signature (9,-27,27). FORMULA G.f.: 18*x^2/(1-3*x)^3. - Vincenzo Librandi, Feb 10 2013 a(n) = 18*A027472(n+1). - R. J. Mathar, Apr 26 2015 MATHEMATICA CoefficientList[Series[18 x^2/(1 - 3 x)^3, {x, 0, 30}], x] (* Vincenzo Librandi, Feb 10 2013 *) LinearRecurrence[{9, -27, 27}, {0, 0, 18}, 40] (* Harvey P. Dale, Dec 15 2014 *) PROG (Magma) [(n^2-n)*3^n: n in [0..25]]; // Vincenzo Librandi, Feb 10 2013 CROSSREFS Cf. A036289, A007758. Sequence in context: A171642 A158808 A271899 * A008418 A099196 A041618 Adjacent sequences: A128794 A128795 A128796 * A128798 A128799 A128800 KEYWORD nonn,easy AUTHOR Mohammad K. Azarian, Apr 07 2007 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 May 30 03:00 EDT 2024. Contains 372957 sequences. (Running on oeis4.)