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 A144628 #2 Mar 30 2012 16:51:00 %S A144628 0,0,1,0,0,1,2,0,1,0,0,1,2,3,0,1,2,0,1,0,0,1,2,3,4,0,1,2,3,0,1,2,0,1, %T A144628 0,0,1,2,3,4,5,0,1,2,3,4,0,1,2,3,0,1,2,0,1,0,0,1,2,3,4,5,6,0,1,2,3,4, %U A144628 5,0,1,2,3,4,0,1,2,3,0,1,2,0,1,0,0,1,2,3,4,5,6,7,0,1,2,3,4,5,6 %N A144628 Central members of triples listed in A144625. %K A144628 nonn %O A144628 0,7 %A A144628 _N. J. A. Sloane_, Jan 18 2009