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 A229729 #11 Mar 09 2020 05:40:40 %S A229729 0,0,0,0,8,42,178,664,2288 %N A229729 Number of separable permutations with exactly four occurrences of the 1-box pattern. %C A229729 See Kitaev-Remmel for precise definition. %H A229729 S. Kitaev and J. Remmel, <a href="http://arxiv.org/abs/1305.6970">The 1-box pattern on pattern avoiding permutations</a>, arXiv preprint arXiv:1305.6970 [math.CO], 2013. %Y A229729 Cf. A229730. %K A229729 nonn,more %O A229729 0,5 %A A229729 _N. J. A. Sloane_, Oct 01 2013