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 A052438 #17 Feb 16 2025 08:32:42 %S A052438 0,2,0,2,4,19,84,821,12485,343572,16164685,1289300669 %N A052438 Number of simple unlabeled n-node graphs with 2 center nodes. %H A052438 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/GraphCenter.html">Graph Center</a> %Y A052438 Column 2 of A294525 for n > 2. %Y A052438 Cf. A052437, A052439, A052440, A052441. %K A052438 nonn,more %O A052438 1,2 %A A052438 _Eric W. Weisstein_ %E A052438 a(8)-a(10) from _Andrew Howroyd_, Nov 02 2017 %E A052438 a(11)-a(12) from _Sean A. Irvine_, Nov 23 2021