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 A199029 #24 May 07 2025 11:54:58 %S A199029 8,98,1088,11978,131768,1449458,15944048,175384538,1929229928, %T A199029 21221529218,233436821408,2567805035498,28245855390488, %U A199029 310704409295378,3417748502249168,37595233524740858,413547568772149448,4549023256493643938,50039255821430083328,550431814035730916618 %N A199029 a(n) = 9*11^n - 1. %H A199029 Vincenzo Librandi, <a href="/A199029/b199029.txt">Table of n, a(n) for n = 0..900</a> %H A199029 <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (12,-11). %F A199029 a(n) = 11*a(n-1) + 10. %F A199029 a(n) = 12*a(n-1) - 11*a(n-2). %F A199029 From _Bruno Berselli_, Nov 03 2011: (Start) %F A199029 G.f.: 2*(4+x)/((1-x)*(1-11*x)). %F A199029 a(n) = 2*A199028(n). (End) %F A199029 From _Elmo R. Oliveira_, May 07 2025: (Start) %F A199029 E.g.f.: exp(x)*(9*exp(10*x) - 1). %F A199029 a(n) = A199763(n) - 2. (End) %o A199029 (Magma) [9*11^n-1: n in [0..20]]; %Y A199029 Cf. A199028, A199763. %K A199029 nonn,easy %O A199029 0,1 %A A199029 _Vincenzo Librandi_, Nov 03 2011