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 A278590 #10 Dec 03 2016 08:48:05 %S A278590 1,1,4,40,778,25306 %N A278590 a(n) = A278589(n)/2^n. %H A278590 Z. Hamaker, E. Marberg, B. Pawlowski, <a href="https://arxiv.org/abs/1601.02269">Involution words II: braid relations and atomic structures</a>, arXiv preprint arXiv:1601.02269, 2016. See Remark following Th. 6.18. %Y A278590 Cf. A212417, A278589. %K A278590 nonn,more %O A278590 0,3 %A A278590 _N. J. A. Sloane_, Dec 02 2016