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 A219388 #21 Dec 19 2018 09:18:27 %S A219388 8,7,7,6,6,6,5,5,5,5,4,4,4,4,3,3,3,2,2,1 %N A219388 Basic quantic arrangement for the 1 to 120 planetary electrons and elementary periods (circles I to XX) distributed by energy levels. %C A219388 In his last publication (see the reference, leaflet 5 (number 12)), Janet (1849-1932) wrote: Arrangement quantique de base,des électrons planétaires,(1 à 120),et des périodes élémentaires (cercles I à XX) disposées par niveaux d'énergie. This corresponds to 1,2,3,4,4,3,2,1 terms (*) of 8 to 1. In the example. %C A219388 Hence for the periodic table,the distribution %C A219388 120 119 %C A219388 88 87 118....113 %C A219388 56 55 86.....81 112....103 %C A219388 38 37 54.....49 80.....71 102....89 %C A219388 20 19 36.....31 48.....39 70....57 %C A219388 12 11 18.....13 30.....21 %C A219388 4 3 10......5 %C A219388 2 1. %C A219388 From right to left this is the ADOMAH periodic table (2006) in A217927(n). %C A219388 A rotation of 180 degrees leads to the (B) periodic table in A217927(n). %C A219388 Note that the rotation of the example gives %C A219388 1 %C A219388 2 2 %C A219388 3 3 3 %C A219388 4 4 4 4 %C A219388 5 5 5 5 %C A219388 6 6 6 %C A219388 7 7 %C A219388 8. %C A219388 Hence the (B) table in A217927. %C A219388 (*) See A090281. %D A219388 Charles Janet, Concordance de l'arrangement quantique, de base, des électrons planétaires des atomes, avec la classification scalariforme, hélicoïdale, des éléments chimiques, Novembre 1930, N6, Beauvais, 55 pages, 6 leaflets. %H A219388 Mark R. Leach curator, The Internet Database of Periodic Tables, <a href="https://www.meta-synthesis.com/webbook/35_pt/pt_database.php?PT_id=154">1930 Janet's Shell Filling diagram</a> %e A219388 8 %e A219388 7 7 %e A219388 6 6 6 %e A219388 5 5 5 5 %e A219388 4 4 4 4 %e A219388 3 3 3 %e A219388 2 2 %e A219388 1 %e A219388 The 20 numbers are presented each one in a circle. %e A219388 The columns are what is now quantum numbers l=0,1,2,3. %K A219388 nonn,fini,less %O A219388 1,1 %A A219388 _Paul Curtz_, Nov 19 2012