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 A333731 #4 Apr 03 2020 21:54:02 %S A333731 0,0,0,0,1,1,4,41,1981,304496,78322916,27033154065,11934777413049, %T A333731 6593485023089912,4485517185017734885,3707462300996644966161, %U A333731 3680029088808704302571244,4341813441626431900011624077,6033239205199253768404631967656,9792722283774379198364367866020815 %N A333731 Number of simple 5-regular bipartite graphs with 2n nodes. %F A333731 Euler transform of A006825. %Y A333731 Column k=5 of A008327. %K A333731 nonn %O A333731 1,7 %A A333731 _Andrew Howroyd_, Apr 03 2020