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 A207408 #9 Mar 31 2012 10:33:03 %S A207408 0,0,0,1,4,12,27,84,212,694,2105,7354,25469,95631,364957 %N A207408 Number of connected triangle-free graphs on n nodes with edge chromatic number 3. %Y A207408 Cf. A116079. %K A207408 nonn %O A207408 1,5 %A A207408 _Michael Sollami_, Feb 17 2012