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 A133172 #7 Feb 28 2020 05:33:30 %S A133172 0,0,0,1,0,1,1,5,3,17,19,131,262,1448,5743,34514,194239,1302209, %T A133172 9011123 %N A133172 Species of unordered Latin bi-trades of size n. %H A133172 I. M. Wanless, <a href="https://ajc.maths.uq.edu.au/pdf/39/ajc_v39_p247.pdf">A computer enumeration of small latin trades</a>, Australas. J. Combin. 39, (2007) 247-258. %Y A133172 Cf. A007083. %K A133172 nonn,more %O A133172 1,8 %A A133172 _Ian Wanless_, Oct 11 2007