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 A030250 #12 Feb 15 2015 02:16:07 %S A030250 1,0,3,978,56630832,813802235250650,4797611106478930201025520, %T A030250 17327898558894838031017212608777367670, %U A030250 53493753018329066207577438898229132113128344235601408 %N A030250 Number of nonisomorphic groupoids with no idempotents. %H A030250 <a href="/index/Gre#groupoids">Index entries for sequences related to groupoids</a> %Y A030250 Cf. A001329, A038018. %K A030250 nonn %O A030250 0,3 %A A030250 _Christian G. Bower_, Feb 15 1998 and May 15 1998