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 A145752 #2 Mar 30 2012 16:51:01 %S A145752 1,105,350,630,504,210,720 %N A145752 a(n) = number of elements of order n in simple group Alt(7) of order 2520. %Y A145752 A row of A057740. Cf. A031963. %K A145752 nonn,fini,full %O A145752 1,2 %A A145752 _N. J. A. Sloane_, Apr 06 2009