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 A155627 a(n) = 6^n - 4^n + 1. 13
 1, 3, 21, 153, 1041, 6753, 42561, 263553, 1614081, 9815553, 59417601, 358602753, 2160005121, 12993585153, 78095728641, 469111242753, 2816814940161, 16909479575553, 101491237191681, 609084862103553, 3655058928435201 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Index entries for linear recurrences with constant coefficients, signature (11,-34,24). FORMULA O.g.f.: 1/(1 - 6*x) - 1/(1 - 4*x) + 1/(1 - x). E.g.f.: exp(6*x) - exp(4*x) + exp(x). a(n) = 10*a(n-1)-24*a(n-2)+15 with a(0)=1, a(1)=3 - Vincenzo Librandi, Jul 21 2010 PROG (PARI) a(n)=6^n-4^n+1 \\ Charles R Greathouse IV, Jun 11 2015 CROSSREFS Cf. A155596, A155597, A155598, A155599, A155600, A155601, A155622, A155623, A155624, A155625, A155626. Sequence in context: A074577 A007566 A183412 * A163472 A229809 A074575 Adjacent sequences:  A155624 A155625 A155626 * A155628 A155629 A155630 KEYWORD nonn,easy AUTHOR Mohammad K. Azarian, Jan 29 2009 STATUS approved

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Last modified February 24 10:27 EST 2020. Contains 332209 sequences. (Running on oeis4.)