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 A173642 #16 Dec 02 2014 08:13:17 %S A173642 1,2,2,1,2,2,2,2,1,2,2,2,2,2,3,2,2,4,2,2,5,2,2,6,2,2,6,1,2,2,6,2,2,2, %T A173642 6,2,1,2,2,6,2,2,2,2,6,2,3,2,2,6,2,4,2,2,6,2,5,2,2,6,2,6,2,2,6,2,6,1, %U A173642 2,2,6,2,6,2,2,2,6,2,6,1,2 %N A173642 A distribution of electrons. By rows whose sum is A000027 (for periodic table). %C A173642 Here, up to element 21=Sc (scandium). See the end of Science.ch (physique quantique corpusculaire); error(s) in this table. Element 117 was discovered in 2010. %D A173642 JANET, Charles, Concordance de l'arrangement quantique, de base, des electrons planetaires des atomes, avec la classification scalariforme, helicoidale, des elements chimiques, Novembre 1930, N6 BEAUVAIS, 55 pages + 6 leaflets. See Planche 1. %H A173642 Yu. Ts. Oganessian et al., <a href="http://dx.doi.org/0.1103/PhysRevLett.104.142502">Synthesis of a New Element with Atomic Number Z=117</a>, Phys. Rev. Lett. 104 (2010) 142502. %e A173642 a(3)+a(4)=3, referring to the third element, Lithium. %K A173642 nonn,tabf %O A173642 1,2 %A A173642 _Paul Curtz_, Nov 24 2010