This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A155627 #17 Jun 27 2024 03:45:09
%S A155627 1,3,21,153,1041,6753,42561,263553,1614081,9815553,59417601,358602753,
%T A155627 2160005121,12993585153,78095728641,469111242753,2816814940161,
%U A155627 16909479575553,101491237191681,609084862103553,3655058928435201
%N A155627 a(n) = 6^n - 4^n + 1.
%H A155627 <a href="/index/Rec#order_03">Index entries for linear recurrences with constant coefficients</a>, signature (11,-34,24).
%F A155627 O.g.f.: 1/(1 - 6*x) - 1/(1 - 4*x) + 1/(1 - x).
%F A155627 E.g.f.: exp(6*x) - exp(4*x) + exp(x).
%F A155627 a(n) = 10*a(n-1)-24*a(n-2)+15 with a(0)=1, a(1)=3 - _Vincenzo Librandi_, Jul 21 2010
%t A155627 Table[6^n - 4^n + 1, {n, 0, 25}] (* _Paolo Xausa_, Jun 26 2024 *)
%o A155627 (PARI) a(n)=6^n-4^n+1 \\ _Charles R Greathouse IV_, Jun 11 2015
%Y A155627 Cf. A155596, A155597, A155598, A155599, A155600, A155601, A155622, A155623, A155624, A155625, A155626.
%K A155627 nonn,easy
%O A155627 0,2
%A A155627 _Mohammad K. Azarian_, Jan 29 2009