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 A284734 #7 Apr 07 2017 11:13:22 %S A284734 1,5,33,238,1782,13593,104756 %N A284734 Column 3 of array in A284731. %H A284734 David Anderson, ES Egge, M Riehl, L Ryan, R Steinke, Y Vaughan, <a href="http://arxiv.org/abs/1605.06825">Pattern Avoiding Linear Extensions of Rectangular Posets</a>, arXiv preprint arXiv:1605.06825, 2016 %Y A284734 Cf. A284731, A284733. %K A284734 nonn,more %O A284734 1,2 %A A284734 _N. J. A. Sloane_, Apr 07 2017