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 A199213 #16 Mar 20 2023 11:52:17 %S A199213 2,8,38,188,938,4688,23438,117188,585938,2929688,14648438,73242188, %T A199213 366210938,1831054688,9155273438,45776367188,228881835938, %U A199213 1144409179688,5722045898438,28610229492188,143051147460938,715255737304688 %N A199213 a(n) = (3*5^n+1)/2. %H A199213 Vincenzo Librandi, <a href="/A199213/b199213.txt">Table of n, a(n) for n = 0..1000</a> %H A199213 <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (6,-5). %F A199213 a(n) = 2*A083065(n). %F A199213 a(n) = 5*a(n-1)-2. %F A199213 a(n) = 6*a(n-1)-5*a(n-2). %F A199213 G.f.: 2*(1-2*x)/((1-x)*(1-5*x)). - _Bruno Berselli_, Nov 04 2011 %o A199213 (Magma) [(3*5^n+1)/2: n in [0..30]]; %Y A199213 Cf. A083065. %K A199213 nonn,easy %O A199213 0,1 %A A199213 _Vincenzo Librandi_, Nov 04 2011