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 A380621 #4 Jan 30 2025 15:28:25 %S A380621 1,5,30,208,1894,21440,296952,4799336 %N A380621 Number of unsensed combinatorial maps with n edges and 3 vertices. %C A380621 By duality, also the number of unsensed combinatorial maps with n edges and 3 faces. %Y A380621 Column 3 of A380616. %Y A380621 Cf. A380619 (sensed), A380620 (2 vertices). %K A380621 nonn,more %O A380621 2,2 %A A380621 _Andrew Howroyd_, Jan 28 2025