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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A128987 a(n) = (n^3 - n^2)*4^n. 1
 0, 64, 1152, 12288, 102400, 737280, 4816896, 29360128, 169869312, 943718400, 5075107840, 26575110144, 136096776192, 683973541888, 3382286745600, 16492674416640, 79439715106816, 378506877861888, 1786156639322112 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Vincenzo Librandi, Table of n, a(n) for n = 1..1000 Index entries for linear recurrences with constant coefficients, signature (16,-96,256,-256). FORMULA G.f.: 64x^2(1+2x)/(1-4x)^4. - R. J. Mathar, Dec 19 2008 a(n) = 16*a(n-1) -96*a(n-2) +256*a(n-3)-256*a(n-4). - Vincenzo Librandi, Feb 11 2013 MATHEMATICA LinearRecurrence[{16, -96, 256, -256}, {0, 64, 1152, 12288}, 30] (* Vincenzo Librandi, Feb 11 2013 *) PROG (Magma) [(n^3 - n^2)*4^n: n in [1..25]]; // Vincenzo Librandi, Feb 11 2013 CROSSREFS Cf. A128796, A036289. Sequence in context: A189276 A081102 A250171 * A240788 A240294 A226086 Adjacent sequences: A128984 A128985 A128986 * A128988 A128989 A128990 KEYWORD nonn,easy AUTHOR Mohammad K. Azarian, Apr 30 2007 EXTENSIONS Offset corrected by Mohammad K. Azarian, Nov 20 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 | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified September 29 19:17 EDT 2023. Contains 365776 sequences. (Running on oeis4.)