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 A152753 #2 Mar 30 2012 17:33:56 %S A152753 2,4,2,2,0,2,6,6,2,0,0,0,0,0,0,0,0,0,0,4,2,2,4,0,8,4,8,0,4,2,2,4,0,0, %T A152753 0,0,0,0,0,0,0,0,0,2,6,6,2,0,4,2,2,4,0,2,6,6,2,0,0,0,0,0,0,0,0,0,0,0, %U A152753 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 %N A152753 Last digit of even Catalan number A152670(n). %C A152753 Even values of A152669. %Y A152753 Cf. A000108, A038003, A094389, A152669, A152670. %K A152753 base,easy,nonn %O A152753 1,1 %A A152753 _Omar E. Pol_, Dec 12 2008