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 A086652 #14 Jun 13 2015 00:51:07 %S A086652 6,13,28,58,120,244,496,1000,2016,4048,8128,16288,32640,65344,130816, %T A086652 261760,523776,1047808,2096128,4192768,8386560,16774144,33550336, %U A086652 67102720,134209536,268423168,536854528,1073717248,2147450880 %N A086652 a(n) = A000225(n+3)-A052955(n). %H A086652 <a href="/index/Rec#order_03">Index entries for linear recurrences with constant coefficients</a>, signature (2,2,-4). %F A086652 a(2n) = A006516(n+2); a(2n+1) = A086221(n+1). %F A086652 G.f.: ( 6+x-10*x^2 ) / ( (2*x-1)*(2*x^2-1) ). - _R. J. Mathar_, Sep 15 2012 %F A086652 a(n) = 2^(n+3)-((5-(-1)^n)/2)*2^((2*n-1+(-1)^n)/4). - _Luce ETIENNE_, Sep 23 2014 %p A086652 f:=n->2^(n+3)-((5-(-1)^n)/2)*2^((2*n-1+(-1)^n)/4); %Y A086652 Cf. A000225, A052955, A055010, A086221. %K A086652 nonn,easy %O A086652 0,1 %A A086652 _Marco Matosic_, Jul 27 2003 %E A086652 Edited and extended by _David Wasserman_, Feb 17 2005