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 A278658 #8 Nov 30 2016 20:33:21 %S A278658 130,950,810,54,40000,6100,420,300 %N A278658 Value of Margot's planetary discriminant Pi for n-th planet from the Sun. %C A278658 A value >= 1 indicates that the planet has sufficient mass to clear its orbit. %C A278658 A planet is a solar system body that meets the definition of "planet" passed on August 24, 2006 under Resolution 5A of the 26th General Assembly of the International Astronomical Union. %H A278658 J. Margot, <a href="http://dx.doi.org/10.1088/0004-6256/150/6/185">A Quantitative Criterion for Defining Planets</a>, The Astronomical Journal, Vol. 150, No. 6 (2015), Article 185. %H A278658 J. Margot, <a href="https://arxiv.org/abs/1507.06300">A Quantitative Criterion for Defining Planets</a>, arXiv:1507.06300 [astro-ph.EP], 2015. %H A278658 Wikipedia, <a href="https://en.wikipedia.org/wiki/Clearing_the_neighbourhood">Clearing the neighbourhood</a> %H A278658 Wikipedia, <a href="https://en.wikipedia.org/wiki/IAU_definition_of_planet">IAU definition of planet</a> %Y A278658 Cf. A116448, A118652, A130788, A131500. %K A278658 nonn %O A278658 1,1 %A A278658 _Felix Fröhlich_, Nov 25 2016