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

 Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 59th year, we have over 358,000 sequences, and we’ve crossed 10,300 citations (which often say “discovered thanks to the OEIS”). Other ways to Give
 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A015490 a(0)=1, a(1)=5, a(n) = sum_{k=0}^{k=n-1} 5^k a(k). 0
 1, 5, 26, 676, 85176, 53320176, 166678870176, 2604524025370176, 203481044006070370176, 79484986295915244420370176, 155244193344195757673779920370176, 1516056730871105040228764708644920370176 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS FORMULA a(n) = (5^(n-2) + 1) * a(n-1). - Vincenzo Librandi, Nov 11 2012 PROG (Magma) I:=[1, 5, 26]; [n le 3 select I[n] else (5^(n-2)+1)*Self(n-1): n in [1..15]]; // Vincenzo Librandi, Nov 11 2012 CROSSREFS Sequence in context: A156217 A156216 A320987 * A118366 A226125 A132509 Adjacent sequences: A015487 A015488 A015489 * A015491 A015492 A015493 KEYWORD nonn,easy AUTHOR 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 December 6 08:36 EST 2022. Contains 358605 sequences. (Running on oeis4.)