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 A117612 #8 Jun 25 2012 21:57:47 %S A117612 2,8,18,20,34,40,58,68,92,132,138 %N A117612 An old nuclear shell closure sequence for 2 nucleon states (related to A007290 and A018226) in a square potential well. %C A117612 An earlier theory that led to the nuclear magic number shell theory of A018226. %D A117612 W. E. Burcham, Nuclear Physics, An Introduction, McGraw-Hill, New York, 1963, page 367-368. %F A117612 a(n) = 2*(2*l+1) for quantum number l. %Y A117612 Cf. A007290 and A018226. %K A117612 nonn,uned %O A117612 0,1 %A A117612 _Roger L. Bagula_, Apr 06 2006