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 A185194 #17 Nov 08 2019 15:59:35 %S A185194 0,0,0,0,1,40,35317,56150820,111359017198,278086517599356, %T A185194 877760741062694898,3482578978170418753715,17204168691253789080138981, %U A185194 104690934973509839187285618311,776311587313178356520412354767734,6942595716239018207126337605515965388 %N A185194 Number of unlabeled digraphs on n vertices such that every vertex has outdegree 4. %H A185194 Andrew Howroyd, <a href="/A185194/b185194.txt">Table of n, a(n) for n = 1..50</a> %H A185194 L. Travis, <a href="http://arXiv.org/abs/math.CO/9811127">[math/9811127] Graphical Enumeration: A Species-Theoretic Approach</a> %Y A185194 Column k=4 of A329228. %Y A185194 Cf. A001373, A129524, A185193, A185303. %K A185194 nonn %O A185194 1,6 %A A185194 _Nathaniel Johnston_, Feb 08 2012 %E A185194 Terms a(10) and beyond from _Andrew Howroyd_, Nov 08 2019