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 A198646 #14 Sep 08 2022 08:45:59 %S A198646 10,32,98,296,890,2672,8018,24056,72170,216512,649538,1948616,5845850, %T A198646 17537552,52612658,157837976,473513930,1420541792,4261625378, %U A198646 12784876136,38354628410,115063885232,345191655698,1035574967096,3106724901290 %N A198646 a(n) = 11*3^n-1. %H A198646 Vincenzo Librandi, <a href="/A198646/b198646.txt">Table of n, a(n) for n = 0..1000</a> %H A198646 <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (4,-3). %F A198646 a(n) = 3*a(n-1)+2, a(0)=10. %F A198646 G.f.: (10-8*x) / ((3*x-1)*(x-1)). - _R. J. Mathar_, Oct 30 2011 %F A198646 a(n) = 4*a(n-1)-3*a(n-2). - _Wesley Ivan Hurt_, Oct 02 2021 %F A198646 a(n) = 2*A052909(n+1). - _R. J. Mathar_, Apr 07 2022 %t A198646 11*3^Range[0, 30] - 1 (* _Wesley Ivan Hurt_, Oct 02 2021 *) %o A198646 (Magma) [11*3^n-1: n in [0..30]] %Y A198646 Cf. A027107, A048473, A171498. %K A198646 nonn,easy %O A198646 0,1 %A A198646 _Vincenzo Librandi_, Oct 28 2011