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 A021022 #26 Jan 05 2025 19:51:34
%S A021022 0,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,
%T A021022 5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,
%U A021022 5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5
%N A021022 Decimal expansion of 1/18.
%H A021022 Hideyuki Ohtsuka, <a href="https://web.archive.org/web/2024*/https://www.fq.math.ca/Problems/ElemProbSolnAugust2015.pdf">Problem B-1174</a>, Elementary Problems and Solutions, Fibonacci Quart. 54 (2016), no. 3, p. 273.
%H A021022 <a href="/index/Rec#order_01">Index entries for linear recurrences with constant coefficients</a>, signature (1).
%F A021022 Equals -Sum_{n>=3} (-1)^n/(Fibonacci(n)^4-1). - _Michel Marcus_, May 14 2021
%F A021022 From _Elmo R. Oliveira_, Aug 05 2024: (Start)
%F A021022 G.f.: 5*x/(1-x).
%F A021022 E.g.f.: 5*(exp(x) - 1).
%F A021022 a(n) = 5 for n >= 1. (End)
%e A021022 0.05555555555555555555555555555555555555555555555555...
%t A021022 PadRight[{0}, 100, 5] (* _Paolo Xausa_, Nov 24 2024 *)
%Y A021022 Cf. A010716, A244855.
%K A021022 nonn,cons,easy
%O A021022 0,2
%A A021022 _N. J. A. Sloane_