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 A373565 #17 Jun 12 2024 11:43:29
%S A373565 1,2,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
%T A373565 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
%U A373565 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1
%N A373565 Expansion of x + 1/(1 - x).
%H A373565 <a href="/index/Rec#order_01">Index entries for linear recurrences with constant coefficients</a>, signature (1).
%F A373565 a(n) = [x^n] (x^2 - x - 1) / (x - 1).
%F A373565 E.g.f.: exp(x) + x. - _Stefano Spezia_, Jun 10 2024
%t A373565 CoefficientList[Series[x + 1/(1 - x), {x, 0, 105}], x] (* _Michael De Vlieger_, Jun 10 2024 *)
%Y A373565 Cf. A294619.
%K A373565 nonn,easy
%O A373565 0,2
%A A373565 _Peter Luschny_, Jun 10 2024