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 A358815 #8 Feb 16 2025 08:34:04 %S A358815 10,226195360,135495143785470,31074298464967845120, %T A358815 5040439500800000000000000,701129416495732552572667500000, %U A358815 90098172307754257628918141363625670,11062145603354190616166421646710839715840 %N A358815 Number of spanning trees in C_10 X C_n. %H A358815 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/SpanningTree.html">Spanning Tree</a> %H A358815 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/TorusGridGraph.html">Torus Grid Graph</a> %o A358815 (PARI) default(realprecision, 120); %o A358815 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 A358815 a(n) = T(10, n); %Y A358815 Row 10 of A212796. %K A358815 nonn %O A358815 1,1 %A A358815 _Seiichi Manyama_, Dec 02 2022