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 A117635 #3 Mar 30 2012 17:34:20 %S A117635 1,5,17,25,47,79,165 %N A117635 Royal elements sequence from A018226 plus closed next shell at 168: H,B,Cl,Mn,Ag,Au,X(Unknown). %C A117635 The 168 (168-3) is arrived at as the inert gas state electrically when the next f electrons and the first g electrons are filled. It also agrees with the Meastro sequence at 13^2. This approach predicts a relatively stable state about 16 neutrons/protons lower than the Pythagoren approach mentioned in A018226. 168 also has the benefit of being the Klein SPL(2,7) and Fano projective Plane group element number in a geodetic geometric model. %F A117635 a(n) = Abs[A018226[n]-3] %Y A117635 Cf. A018226. %K A117635 nonn,uned %O A117635 0,2 %A A117635 _Roger L. Bagula_, Apr 08 2006