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 A155628 a(n) = 7^n-4^n+1^n. 21
 1, 4, 34, 280, 2146, 15784, 113554, 807160, 5699266, 40091464, 281426674, 1973132440, 13824509986, 96821901544, 677954637394, 4746487768120, 33228635602306, 232613334118024, 1628344878433714, 11398620307466200 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Index entries for linear recurrences with constant coefficients, signature (12,-39,28). FORMULA G.f.: 1/(1-7*x)-1/(1-4*x)+1/(1-x). E.g.f.: e^(7*x)-e^(4*x)+e^x. a(n) = 11*a(n-1)-28*a(n-2)+18 with a(0)=1, a(1)=4. - Vincenzo Librandi, Jul 21 2010 MATHEMATICA Table[7^n-4^n+1, {n, 0, 20}] (* or *) LinearRecurrence[{12, -39, 28}, {1, 4, 34}, 20] (* Harvey P. Dale, Jul 16 2017 *) PROG (PARI) a(n)=7^n-4^n+1 \\ Charles R Greathouse IV, Sep 24 2015 CROSSREFS Cf. A155596, A155597, A155598, A155599, A155600, A155601, A155622, A155623, A155624, A155625, A155626, A155627. Sequence in context: A216239 A335667 A201684 * A346936 A036352 A005569 Adjacent sequences:  A155625 A155626 A155627 * A155629 A155630 A155631 KEYWORD nonn,easy AUTHOR Mohammad K. Azarian, Jan 30 2009 STATUS approved

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Last modified July 4 08:01 EDT 2022. Contains 355070 sequences. (Running on oeis4.)