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 A059105 #4 Nov 12 2015 01:28:47 %S A059105 0,0,1,4,101,5004 %N A059105 Number of n-dimensional torsion-free crystallographic groups with trivial center. %H A059105 W. Plesken and T. Schulz, <a href="http://wwwb.math.rwth-aachen.de/carat/">CARAT Homepage</a> %H A059105 W. Plesken and T. Schulz, <a href="/A006226/a006226.pdf">CARAT Homepage</a> [Cached copy in pdf format (without subsidiary pages), with permission] %H A059105 W. Plesken and T. Schulz, <a href="/A006226/a006226_1.pdf">Introduction to CARAT</a> [Cached copy in pdf format (without subsidiary pages), with permission] %Y A059105 Cf. A004027, A004028, A004029, A059104. %K A059105 nonn,hard,nice,more %O A059105 1,4 %A A059105 Tilman Schulz (tilman(AT)momo.math.rwth-aachen.de), Feb 13 2001