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 A057133 #4 May 10 2013 12:44:31 %S A057133 3,18,3645,317831937966,3695220735363494263609015164945808626, %T A057133 121096725674945775281820931369251071805435386335925283528419283108512015348357219417301307065046229239236569208945 %N A057133 Number of equivalence classes of self-dual 3-valued Post functions of n variables under action of symmetric group S_n. %C A057133 Next term has 345 digits. %Y A057133 Cf. A001531, A057132, A057134, A001321. %K A057133 nonn %O A057133 1,1 %A A057133 _Vladeta Jovovic_, Aug 11 2000