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 A155633 #14 Jun 12 2015 15:26:54 %S A155633 1,10,60,340,1920,10900,62280,358060,2070240,12030820,70231800, %T A155633 411625180,2420922960,14281397140,84467679720,500702562700, %U A155633 2973697798080,17689598897860,105374653934040,628433226338620 %N A155633 6^n+5^n-1. %H A155633 <a href="/index/Rec">Index entries for linear recurrences with constant coefficients</a>, signature (12,-41,30). %F A155633 G.f.: 1/(1-6*x)+1/(1-5*x)-1/(1-x). E.g.f.: e^(6*x)+e^(5*x)-e^x. %F A155633 a(n)=11*a(n-1)-30*a(n-2)-20 with a(0)=1, a(1)=10 - _Vincenzo Librandi_, Jul 21 2010 %o A155633 (PARI) a(n)=6^n+5^n-1^n \\ _Charles R Greathouse IV_, Jun 11 2015 %Y A155633 Cf. A155596, A155597, A155598, A155599, A155600, A155601, A155622, A155623, A155624, A155625, A155626, A155627, A155628, A155629, A155630, A155631. %K A155633 nonn,easy %O A155633 0,2 %A A155633 _Mohammad K. Azarian_, Jan 30 2009