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 A300552 #10 Feb 16 2025 08:33:53 %S A300552 0,5,10,24,35,80,90,170,220,420,364,644,780,1120,1139,1854,1748,2580, %T A300552 2898,3916,3450,6072,5350,7046,7398,10024,10063,14250,13795,16608, %U A300552 16566,21114,21595,26316,26640,32718,32370,39520,38622,52416,47558,56232,57240 %N A300552 Number of 4-cycles in the n-polygon diagonal intersection graph. %H A300552 Andrew Howroyd, <a href="/A300552/b300552.txt">Table of n, a(n) for n = 3..100</a> %H A300552 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/GraphCycle.html">Graph Cycle</a> %H A300552 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PolygonDiagonalIntersectionGraph.html">Polygon Diagonal Intersection Graph</a> %Y A300552 Cf. A062361 (3-cycles), A300553 (5-cycles), A300554 (6-cycles). %K A300552 nonn %O A300552 3,2 %A A300552 _Eric W. Weisstein_, Mar 08 2018 %E A300552 Terms a(21) and beyond from _Andrew Howroyd_, Mar 11 2018