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 A185193 #17 Nov 08 2019 15:59:01 %S A185193 0,0,0,1,13,1499,257290,56150820,14971125930,4829990898461, %T A185193 1864386642498918,851204815909786099,454661054439318678263, %U A185193 281270600132956104641972,199701092658236514672384967,161392692052798327047616107614,147373164027242947672475065773269 %N A185193 Number of unlabeled digraphs on n vertices such that every vertex has outdegree 3. %H A185193 Andrew Howroyd, <a href="/A185193/b185193.txt">Table of n, a(n) for n = 1..50</a> %H A185193 L. Travis, <a href="http://arXiv.org/abs/math.CO/9811127">[math/9811127] Graphical Enumeration: A Species-Theoretic Approach</a> %Y A185193 Column k=3 of A329228. %Y A185193 Cf. A001373, A129524, A185194, A185303. %K A185193 nonn %O A185193 1,5 %A A185193 _Nathaniel Johnston_, Feb 08 2012 %E A185193 Terms a(10) and beyond from _Andrew Howroyd_, Nov 08 2019