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 A358812 #8 Feb 16 2025 08:34:04 %S A358812 7,799694,7839321861,40643137651228,168437773747672835, %T A358812 633426582213424399722,2266101334892340404752384, %U A358812 7871822605982542067643202616,26818349084747196820449212376063,90098172307754257628918141363625670,299464785482715726798502702429093755197 %N A358812 Number of spanning trees in C_7 X C_n. %H A358812 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/SpanningTree.html">Spanning Tree</a> %H A358812 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/TorusGridGraph.html">Torus Grid Graph</a> %o A358812 (PARI) default(realprecision, 120); %o A358812 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 A358812 a(n) = T(7, n); %Y A358812 Row 7 of A212796. %K A358812 nonn %O A358812 1,1 %A A358812 _Seiichi Manyama_, Dec 02 2022