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 A244005 #7 Jun 19 2014 11:59:27 %S A244005 3,4,11,12,13,19,20,37,38,55,56,87,88 %N A244005 Atomic numbers of the pre-transition metals. %C A244005 Aluminium (Z = 13) is referred to as a pre-transition metal, along with the group 1 alkali metals (A099955) and group 2 alkaline earth metals (A099956). %D A244005 P. A. Cox, Instant Notes; Inorganic Chemistry, 2nd edition, Taylor & Francis, 2004, pp. 188-189. %Y A244005 Cf. A099955, A099956. %K A244005 nonn,fini,full %O A244005 1,1 %A A244005 _Arkadiusz Wesolowski_, Jun 17 2014