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 A052439 #15 Feb 16 2025 08:32:42 %S A052439 0,0,3,0,4,18,119,1055,17297,486446,24269709,2095669951 %N A052439 Number of simple unlabeled n-node graphs with 3 center nodes. %H A052439 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/GraphCenter.html">Graph Center</a> %Y A052439 Column 3 of A294525 for n > 3. %Y A052439 Cf. A052437, A052438, A052440, A052441. %K A052439 nonn,more %O A052439 1,3 %A A052439 _Eric W. Weisstein_ %E A052439 a(8)-a(10) from _Andrew Howroyd_, Nov 02 2017 %E A052439 a(11)-a(12) from _Sean A. Irvine_, Nov 23 2021