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 A057134 #4 May 10 2013 12:44:31 %S A057134 4,128,716353536,14178431955039404875762272791942922240, %T A057134 111731732749521642496450208318382051062328048504936611481207677617341443706047938314290688070835642649073892130179773602200265988880358130183392743915520 %N A057134 Number of equivalence classes of self-dual 4-valued Post functions of n variables under action of symmetric group S_n. %C A057134 Next term has 614 digits. %Y A057134 Cf. A001531, A057132, A057133, A001321. %K A057134 nonn %O A057134 1,1 %A A057134 _Vladeta Jovovic_, Aug 11 2000