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 A026201 #7 Oct 14 2019 21:08:23 %S A026201 1,2,5,3,9,4,13,6,17,7,21,8,25,10,29,11,33,12,37,14,41,15,45,16,49,18, %T A026201 53,19,57,20,61,22,65,23,69,24,73,26,77,27,81,28,85,30,89,31,93,32,97, %U A026201 34,101,35,105,36,109,38,113,39,117,40,121 %N A026201 Position of n in A026200. %F A026201 Conjectures from _Colin Barker_, Oct 14 2019: (Start) %F A026201 G.f.: x*(1 + 2*x + 4*x^2 + x^3 + 4*x^4 + x^5 + 3*x^6) / ((1 - x)^2*(1 + x)^2*(1 - x + x^2)*(1 + x + x^2)). %F A026201 a(n) = a(n-2) + a(n-6) - a(n-8) for n>8. %F A026201 (End) %K A026201 nonn %O A026201 1,2 %A A026201 _Clark Kimberling_