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 A134984 #7 Mar 30 2012 18:51:53 %S A134984 1,3,11,19,37,55,87,4,12,20,38,56,88,21,39,57,89,58,90,59,91,60,92,61, %T A134984 93,62,94,63,95,64,96,65,97,66,98,67,99,68,100,69,101,70,102,71,103, %U A134984 22,40,72,104,23,41,73,105,24,42,74,106,25,43,75,107,26,44,76,108,27,45,77 %N A134984 The atomic numbers of the periodic table of the elements, read downwards along 32 columns. %H A134984 N. N., <a href="http://webelements.com/nexus/Extended_Periodic_Table">WebElements periodic table</a>. %e A134984 The elements in that order are H=1, Li=3, Na=11, K=19, Rb=37 etc. %e A134984 Columns of transition metals and Lanthanides and Actinides are included, so there are 32 of them and after Ac=89 we continue with Ce=58. %K A134984 nonn,tabf %O A134984 0,2 %A A134984 _Paul Curtz_, Feb 05 2008 %E A134984 Edited by _R. J. Mathar_, Feb 06 2008