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 A051504 #12 Dec 06 2020 17:17:47 %S A051504 1,1,1,7,136,8001,1445297,863488287 %N A051504 Number of asymmetric digraphs with n nodes. %D A051504 F. Harary and E. M. Palmer, Graphical Enumeration, Academic Press, NY, 1973, p. 231. %D A051504 P. K. Stockmeyer, The enumeration of graphs with prescribed automorphism group, Dissertation, Univ. of Michigan, Ann Arbor, 1971. %F A051504 a(n) = A000273(n) - A067309(n). - _Andrew Howroyd_, Dec 06 2020 %Y A051504 Cf. A000273 (digraphs), A003400 (asymmetric graphs), A030242 (asymmetric relations), A067309. %K A051504 hard,nonn,nice %O A051504 0,4 %A A051504 _Vladeta Jovovic_ %E A051504 a(6) from _Christian G. Bower_ Dec 15 1999 %E A051504 a(7) from _Andrew Howroyd_, Dec 06 2020