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 A106578 #3 Mar 30 2012 18:59:07 %S A106578 1,1,1,1,2,1,3,6,2,4,48 %N A106578 First differences of indices of squarefree central binomial numbers. %C A106578 First differences of A046098. Next term >= 27929. %Y A106578 Cf. A001405. %K A106578 nonn %O A106578 0,5 %A A106578 _Paul Barry_, May 09 2005