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 A284733 #5 Apr 07 2017 11:12:52 %S A284733 1,5,33,234,1706,12618 %N A284733 Row 3 of array in A284731. %H A284733 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 A284733 Cf. A284731, A284734. %K A284733 nonn,more %O A284733 1,2 %A A284733 _N. J. A. Sloane_, Apr 07 2017