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 A157222 #11 May 09 2018 23:01:37 %S A157222 0,1,1,2,3,3,4,5,6,5,8,6,9,10,10,8,15,9,14,14,15,11,21,14,18,17,22,14, %T A157222 30 %N A157222 Erroneous version of A304183. %H A157222 John S. Rutherford, <a href="http://dx.doi.org/10.1107/S010876730804333X">Sublattice enumeration. IV. Equivalence classes of plane sublattices by parent Patterson symmetry and colour lattice group type</a>, Acta Cryst. (2009). A65, 156-163. [See Table 4. Contains errors for n = 24 and 28.] %K A157222 dead %O A157222 2,4 %A A157222 _N. J. A. Sloane_, Feb 25 2009