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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A198643 a(n) = 5*3^n-1. 6
 4, 14, 44, 134, 404, 1214, 3644, 10934, 32804, 98414, 295244, 885734, 2657204, 7971614, 23914844, 71744534, 215233604, 645700814, 1937102444, 5811307334, 17433922004, 52301766014, 156905298044, 470715894134, 1412147682404, 4236443047214 (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 = 2*A060816(n+1). G.f.: ( 4-2*x ) / ( (3*x-1)*(x-1) ). - R. J. Mathar, Nov 17 2011 PROG (Magma) [5*3^n-1: n in [0..30]] (PARI) a(n)=5*3^n-1 \\ Charles R Greathouse IV, Oct 07 2015 CROSSREFS Cf. A027107, A048473, A171498. Sequence in context: A027831 A097894 A065835 * A097137 A083377 A047115 Adjacent sequences: A198640 A198641 A198642 * A198644 A198645 A198646 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 1 20:05 EST 2024. Contains 370443 sequences. (Running on oeis4.)