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 A052440 #16 Feb 16 2025 08:32:42 %S A052440 0,0,0,7,0,18,118,1426,24853,763319,39773455,3569963990 %N A052440 Number of simple unlabeled n-node graphs with 4 center nodes. %H A052440 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/GraphCenter.html">Graph Center</a> %Y A052440 Column 4 of A294525 for n > 4. %Y A052440 Cf. A052437, A052438, A052439, A052441. %K A052440 nonn,more %O A052440 1,4 %A A052440 _Eric W. Weisstein_ %E A052440 a(8)-a(10) from _Andrew Howroyd_, Nov 02 2017 %E A052440 a(11)-a(12) from _Sean A. Irvine_, Nov 23 2021