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 A266187 #7 Dec 29 2015 03:25:53 %S A266187 1,3,8,22,49,115,258,1040,2610 %N A266187 a(n) = A266196(A000225(n)); index of (2^n)-1 in A266195. %C A266187 A264982(a(n)) is the last term k in A264982 for which A070939(k) = n. %F A266187 a(n) = A266196(A000225(n)). %Y A266187 Cf. A000225, A070939, A264982, A266195, A266196, A266186. %K A266187 nonn,base,more %O A266187 1,2 %A A266187 _Antti Karttunen_, Dec 26 2015