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 A007577 #13 Feb 25 2020 02:09:57 %S A007577 1,20,400,8902,197281,4865577,119057155,3194833218 %N A007577 Number of chess games with n plies (another version). %H A007577 Andrei Asinowski, Axel Bacher, Cyril Banderier, Bernhard Gittenberger, <a href="https://lipn.univ-paris13.fr/~banderier/Papers/patterns2019.pdf">Analytic combinatorics of lattice paths with forbidden patterns, the vectorial kernel method, and generating functions for pushdown automata</a>, Laboratoire d'Informatique de Paris Nord (LIPN 2019). %H A007577 <a href="/index/Ch#chess">Index entries for sequences related to number of chess games</a> %Y A007577 Cf. A048987. %K A007577 hard,fini,nonn %O A007577 0,2 %A A007577 Johan Boye (jb(AT)sectra.se) %E A007577 I am not sure of the precise rules that were used to compute these numbers. A048987 is the preferred version of this sequence. - _N. J. A. Sloane_.