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 A051269 #6 Jun 13 2013 11:37:37 %S A051269 8,536887296,6760803201217232481859791749120, %T A051269 301541899055510925582216106793458790276811863115050592580304890195754352640 %N A051269 Number of self-complementary 3-place relations on a 2n-element set. %Y A051269 Cf. A047832. %K A051269 nonn %O A051269 1,1 %A A051269 _Vladeta Jovovic_