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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A198645 a(n) = 10*3^n - 1. 3
 9, 29, 89, 269, 809, 2429, 7289, 21869, 65609, 196829, 590489, 1771469, 5314409, 15943229, 47829689, 143489069, 430467209, 1291401629, 3874204889, 11622614669, 34867844009, 104603532029, 313810596089, 941431788269, 2824295364809 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 LINKS Vincenzo Librandi, Table of n, a(n) for n = 0..1000 Index entries for linear recurrences with constant coefficients, signature (4,-3). FORMULA a(n) = 3*a(n-1) + 2, a(0)=9. G.f. ( 9-7*x ) / ( (3*x-1)*(x-1) ). - R. J. Mathar, Oct 30 2011 MATHEMATICA 10 * 3^Range[0, 30]-1 (* Harvey P. Dale, Feb 28 2022 *) PROG (Magma) [10*3^n-1: n in [0..30]] CROSSREFS Cf. A048473. Sequence in context: A318742 A024922 A193004 * A045862 A035075 A103535 Adjacent sequences: A198642 A198643 A198644 * A198646 A198647 A198648 KEYWORD nonn,easy AUTHOR Vincenzo Librandi, Oct 28 2011 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 March 21 18:35 EDT 2023. Contains 361410 sequences. (Running on oeis4.)