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 A178671 a(n) = 5^n - 5. 3
 -4, 0, 20, 120, 620, 3120, 15620, 78120, 390620, 1953120, 9765620, 48828120, 244140620, 1220703120, 6103515620, 30517578120, 152587890620, 762939453120, 3814697265620, 19073486328120, 95367431640620, 476837158203120, 2384185791015620, 11920928955078120 (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 (6,-5). FORMULA a(n) = 5*a(n-1) + 20, n>0. From R. J. Mathar, Jan 03 2011: (Start) G.f.: 4*(-1+6*x)/((1-5*x)*(1-x)). a(n) = 4*A104891(n-1), n>0. (End) a(n) = 6*a(n-1) - 5*a(n-2). - Vincenzo Librandi, Jan 25 2013 E.g.f.: exp(5*x) - 5*exp(x). - G. C. Greubel, Jan 28 2019 MATHEMATICA 5^Range[0, 30]-5 (* Vladimir Joseph Stephan Orlovsky, Feb 20 2011* ) PROG (MAGMA) [5^n-5: n in [0..25]]; (PARI) vector(30, n, n--; 5^n-5) \\ G. C. Greubel, Jan 28 2019 (Sage) [5^n-5 for n in range(30)] # G. C. Greubel, Jan 28 2019 (GAP) List([0..30], n -> 5^n-5); # G. C. Greubel, Jan 28 2019 CROSSREFS Cf. A178676 (5^n+5). Sequence in context: A286032 A199933 A078630 * A179270 A246132 A229827 Adjacent sequences:  A178668 A178669 A178670 * A178672 A178673 A178674 KEYWORD sign,easy AUTHOR Vincenzo Librandi, Dec 25 2010 STATUS approved

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Last modified June 18 13:21 EDT 2021. Contains 345112 sequences. (Running on oeis4.)