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 A361171 #18 Feb 16 2025 08:34:04 %S A361171 0,0,1,13,197,4729,156806,7035482,505265569,82612843683, %T A361171 33651820752580,23922790371389972,25614853328191562332, %U A361171 43322613720440154974138,128405885225433787867253690,738840753928503040569961869076,8481241718402438554921627740308746,179685856472407342498054958799766397100 %N A361171 Number of chordless cycles in the n X n king graph. %C A361171 Using the convention that chordless cycles have length >= 4. %H A361171 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/ChordlessCycle.html">Chordless Cycle</a> %H A361171 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/KingGraph.html">King Graph</a> %Y A361171 Cf. A140519, A234622, A297664, A357501. %K A361171 nonn %O A361171 1,4 %A A361171 _Eric W. Weisstein_, Mar 03 2023 %E A361171 a(7)-a(18) from _Andrew Howroyd_, Mar 03 2023