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 A161391 #12 Jul 28 2017 09:23:37 %S A161391 1,2,9,60,530,5820 %N A161391 Dimension sequence of the right-alternative (=left-alternative) operad. %H A161391 A. Dzhumadil'daev and P. Zusmanovich, <a href="https://arxiv.org/abs/0906.1272">The alternative operad is not Koszul</a>, arXiv:0906.1272 [math.RA], 2009-2013. %Y A161391 Cf. A161392, A161393. %K A161391 more,nonn %O A161391 1,2 %A A161391 _Pasha Zusmanovich_, Jun 09 2009