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 A219116 #14 Nov 13 2012 09:37:39 %S A219116 0,1,2,9,108,3645,354294,100442349,83682825624,205891132094649, %T A219116 1500946352969991210,32497439772059170685073, %U A219116 2093390532109442148854046084,401741006974223960704968343445877,229924845755649214047240549209929574046 %N A219116 Number of semicomplete digraphs on n nodes with an "Emperor". %C A219116 a(n) is also the number of asymmetric digraphs on n nodes with an "Emperor". %F A219116 a(n) = n*3^((n^2 - 3*n + 2)/2). %o A219116 (Maxima) A219116(n):=n*3^((n^2-3*n+2)/2)$ makelist(A219116(n),n,0,14); /* _Martin Ettl_, Nov 13 2012 */ %Y A219116 See also A123903 for tournaments and A217652 for digraphs. %K A219116 nonn %O A219116 0,3 %A A219116 _Rémy-Robert Joseph_, Nov 12 2012