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 A155644 #17 Aug 31 2025 21:01:30
%S A155644 1,7,97,1207,14017,157927,1755937,19409047,213968257,2355994567,
%T A155644 25927658977,285262842487,3138184236097,34521491440807,
%U A155644 379743730067617,4177217651837527,45949577275681537,505446265559840647
%N A155644 a(n) = 11^n-5^n+1.
%H A155644 <a href="/index/Rec">Index entries for linear recurrences with constant coefficients</a>, signature (17,-71,55).
%F A155644 G.f.: 1/(1-11*x)-1/(1-5*x)+1/(1-x).
%F A155644 E.g.f.: e^(11*x)-e^(5*x)+e^x.
%F A155644 a(n) = 16*a(n-1)-55*a(n-2)+40 with a(0)=1, a(1)=7. - _Vincenzo Librandi_, Jul 21 2010
%F A155644 a(0)=1, a(1)=7, a(2)=97, a(n) = 17*a(n-1)-71*a(n-2)+55*a(n-3). - _Harvey P. Dale_, Jul 11 2011
%t A155644 Table[11^n-5^n+1,{n,0,20}] (* or *) LinearRecurrence[{17, -71, 55}, {1, 7, 97}, 20] (* _Harvey P. Dale_, Jul 11 2011 *)
%o A155644 (PARI) a(n)=11^n-5^n+1 \\ _Charles R Greathouse IV_, Jun 11 2015
%Y A155644 Cf. A155628, A155629, A155630, A155631, A155632, A155633, A155634, A155635, A155636, A155637, A155638, A155639, A155640, A155641, A155642, A155643.
%K A155644 nonn,easy,changed
%O A155644 0,2
%A A155644 _Mohammad K. Azarian_, Jan 30 2009