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 A116650 #9 Jul 23 2017 02:56:25 %S A116650 2,4,5,7,9,11,18,19,20,21,27,29,30,39,42,44,45,46,47,71,73,74,75,76, %T A116650 78,83,87,88,90,109,113,116,120,121,123,127,158,166,167,168,169,171, %U A116650 173,175,176,177,179,184,185,187,188,191,286,289,295,308,309,311,313 %N A116650 Distinct values of A116648, i.e., its duplicates removed. %F A116650 a(n) = A116648(A116649(n)). %Y A116650 Cf. A116648, A116649, A116651. %K A116650 nonn %O A116650 1,1 %A A116650 _Antti Karttunen_, Feb 21 2006