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 A138096 #5 Mar 30 2012 18:51:57 %S A138096 7,6,2,2,2,2,2,2,2,2,2,2,2,2,2,2,4,4,4,4,4,4,4,4,4,4,6,6,6,6,6,7 %N A138096 Number of elements in the n-th column of the second extension of the Mendeleyev-Seaborg periodic table of elements. %C A138096 A variant of A134982, with one term "4" changing place because (relative to the first table) the two elements number 21 and 39 are moved over to the next column of d-metals, placed above element 71. %Y A138096 Cf. A137583, A093907, A134984, A135559. %K A138096 nonn,easy,fini,full,less %O A138096 1,1 %A A138096 _Paul Curtz_, May 03 2008