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 A142859 #6 May 31 2018 05:11:24 %S A142859 1,4,6,28,80,409,2010,13314,99393,919304 %N A142859 Number of fully gated graphs on n nodes. %C A142859 a(n) = A142860(n) + A142861(n) (except there seems to be a typo in the published numbers). %H A142859 C. J. Colbourn and C. Huybrechts, <a href="https://doi.org/10.1016/j.disc.2007.09.039">Fully gated graphs,: recognition and convex operations</a>, Discrete Math., 308 (2008), 5184-5195. [There is a typo in the published version of a(13)] %Y A142859 Cf. A142860, A142861. %K A142859 nonn,more %O A142859 5,2 %A A142859 _N. J. A. Sloane_, Oct 01 2008 %E A142859 a(13) corrected by C. J. Colbourn, Oct 03 2008