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 A122892 #3 Mar 30 2012 18:36:59 %S A122892 1,10,70,424,2382,12804,66946,343772,1744314,8780912,43976688, %T A122892 219546976,1094132461,5448766458,27135655714,135218356264, %U A122892 674461583180,3368432133000,16847360404260,84396523333080,423485559461250 %N A122892 Secondary diagonal of triangle A122890. %C A122892 The main diagonal of triangle A122890 equals the Catalan numbers (A000108); this is the diagonal immediately below (with leading zeros omitted). %Y A122892 Cf. A122890, A122888; A122887. %K A122892 nonn %O A122892 4,2 %A A122892 _Paul D. Hanna_, Sep 18 2006