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 A057997 #6 Mar 30 2012 17:37:11 %S A057997 1,2,3,16,280,56448,118594560,4282251214848,3398378138678329344, %T A057997 75807214831601328114892800 %N A057997 Number of labeled loops (quasigroups with an identity element). %H A057997 <a href="/index/Qua#quasigroups">Index entries for sequences related to quasigroups</a> %Y A057997 a(n)=A000315(n)*n. Cf. A057771. %K A057997 nonn,hard %O A057997 1,2 %A A057997 _Christian G. Bower_, Nov 20 2000