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 A091883 #7 Mar 08 2021 12:25:59 %S A091883 1,0,50,250,3750,31250,343750,3281250,33593750,332031250,3339843750, %T A091883 33300781250,333496093750,3332519531250,33337402343750, %U A091883 333312988281250,3333435058593750,33332824707031250,333335876464843750 %N A091883 Expansion of (1-5x)/((1+5x)(1-10x)). %C A091883 A091903(n)=a(n+1)/50. a(n)/a(n+1)->1/10. %H A091883 <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (5,50). %F A091883 a(n)=10^n/3+2(-5)^n/3. %F A091883 a(n) = 5^n*A078008(n). - _R. J. Mathar_, Mar 08 2021 %K A091883 easy,nonn %O A091883 0,3 %A A091883 _Paul Barry_, Feb 10 2004