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 A163895 #4 Jul 12 2019 14:21:23 %S A163895 0,1,2,6,12,24,72,144,288,864,1728,5184,10368 %N A163895 Positions where A163894 obtains record values. %C A163895 The ratios a(n+1)/a(n) from n>=1 onward start as 2,3,2,2,3,2,2,3,2,3,2,... %Y A163895 See A163896, A309016. %K A163895 nonn %O A163895 0,3 %A A163895 _Antti Karttunen_, Sep 19 2009