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 A178950 #9 Mar 30 2012 18:52:41 %S A178950 1,6,8,14,16,21,27,29,48,49,52,55,57,60,61,65,85,86,90,95,96,112,117, %T A178950 120,121,122,123,124,135,145,153,169,179,181,186,191,213,214,215,216, %U A178950 238,255,256,257,258,259,260,263,267,274,275,281,288,324,325,340,343,345,354,355,356,357,359,366 %N A178950 Numbers n such that A178609(n)=A178609(n+1). %F A178950 A178609(a(n))=A178609(a(n)+1). %Y A178950 Cf. A000040. %K A178950 nonn %O A178950 1,2 %A A178950 _Juri-Stepan Gerasimov_, Dec 31 2010