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 A382158 #11 Jul 09 2025 05:08:28 %S A382158 1,1,2,6,26,209,4115,206205,24982238 %N A382158 Number of n-node oriented graphs (no loops or cycles of length 2), not necessarily connected, which are squares. %C A382158 For the definition of the square of a graph, see A382180. %Y A382158 Cf. A382180. A382157, A382159. %K A382158 nonn,more %O A382158 0,3 %A A382158 _N. J. A. Sloane_, Mar 24 2025, based on an email from _Brendan McKay_, Mar 18 2025