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 A178123 #2 Mar 30 2012 18:59:27 %S A178123 1,1,2,5,16,61,269,1337,7354,44155,286397,1990427,14725738,115356349, %T A178123 952592288,8261093885,74994333994,710656444489,7012302313061, %U A178123 71892455879393,764331907463476,8411953721081635,95684448908132498 %N A178123 Expansion of 1/(1-x-x^2/(1-2x-3x^2/(1-3x-5x^2/(1-4x-7x^2/(1-... (continued fraction). %C A178123 First column of A178125. Hankel transform is A057863. %K A178123 easy,nonn %O A178123 0,3 %A A178123 _Paul Barry_, May 20 2010