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 A080916 #3 Mar 30 2012 18:41:15 %S A080916 1,2,1,2,1,2,3,4,5,6,1,2,1,2,3,4,5,6,1,2,2,2,2,1,2,2,2,2,1,2,1,2,3,4, %T A080916 5,6,1,2,2,2,1,1,2,1,1,10,1,2,1,2,3,4,5,6,1,2,2,2,2,2,2,2,2,2,2,2,2,2, %U A080916 2,2,2,2,2,2,2,2,2,1,1,2,1,2,3,4,5,6,1,2,2,2,2,2,2,2,2,2,2,2 %N A080916 Number of electrons in outermost electron subshell in chemical element number n. %H A080916 C. Heilman, <a href="http://chemlab.pc.maricopa.edu/periodic/periodic.html">The Pictorial Periodic Table</a> %H A080916 E. F. Schubert, <a href="http://www.rpi.edu/~schubert/Educational%20resources/Periodic%20table%20of%20elements-1.pdf">Periodic System of Elements</a> %e A080916 Example: element 46Pd has ten electrons in its 4f-shell, none in its 5s-shell. %Y A080916 Cf. A080915. %K A080916 nonn %O A080916 0,2 %A A080916 _Ralf Stephan_, Feb 23 2003