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 A358814 #8 Feb 16 2025 08:34:04 %S A358814 9,34928082,5312031978672,344499209234302500,16463182598208445194045, %T A358814 687776414074843514847584256,26818349084747196820449212376063, %U A358814 1005049441217682470864686231147005000,36735015407753190053984060991247792275456 %N A358814 Number of spanning trees in C_9 X C_n. %H A358814 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/SpanningTree.html">Spanning Tree</a> %H A358814 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/TorusGridGraph.html">Torus Grid Graph</a> %o A358814 (PARI) default(realprecision, 120); %o A358814 T(n, k) = round(n*k*prod(a=1, n-1, prod(b=1, k-1, 4*sin(a*Pi/n)^2+4*sin(b*Pi/k)^2))); %o A358814 a(n) = T(9, n); %Y A358814 Row 9 of A212796. %K A358814 nonn %O A358814 1,1 %A A358814 _Seiichi Manyama_, Dec 02 2022