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 A171390 #12 Jun 30 2023 15:08:41
%S A171390 36,73,147,295,591,1183,2367,4735,9471,18943,37887,75775,151551,
%T A171390 303103,606207,1212415,2424831,4849663,9699327,19398655,38797311,
%U A171390 77594623,155189247,310378495,620756991,1241513983,2483027967,4966055935
%N A171390 a(n) = 37*2^(n-1)-1.
%H A171390 Vincenzo Librandi, <a href="/A171390/b171390.txt">Table of n, a(n) for n = 1..1000</a>
%H A171390 <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (3, -2).
%F A171390 G.f.: x*(36-35*x)/((1-2*x)*(1-x)). - _Vincenzo Librandi_, Aug 20 2014
%t A171390 Table[37*2^(n-1) - 1, {n, 1, 30}] (* or *) CoefficientList[Series[(36 - 35 x)/((1 - 2 x) (1 - x)), {x, 0, 40}], x] (* _Vincenzo Librandi_, Aug 20 2014 *)
%o A171390 (Magma) [37*2^(n-1)-1: n in [1..30]]; // _Vincenzo Librandi_, Aug 20 2014
%K A171390 nonn
%O A171390 1,1
%A A171390 _Vincenzo Librandi_, Dec 07 2009
%E A171390 Edited by _Jon E. Schoenfield_, Jun 23 2010