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 A278589 #11 Dec 03 2016 08:47:57
%S A278589 1,2,16,320,12448,809792
%N A278589 Number of equivalence classes under the fixed-point-free braid relation B_{FPF}(w_0).
%H A278589 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 A278589 Cf. A212417, A278590.
%K A278589 nonn,more
%O A278589 0,2
%A A278589 _N. J. A. Sloane_, Dec 02 2016