A358813 Number of spanning trees in C_8 X C_n.

8, 5326848, 205683135000, 3771854305099776, 53095647535975155240, 665880333340217184000000, 7871822605982542067643202616, 89927963805390785392395474173952, 1005049441217682470864686231147005000

Offset: 1

Author

Seiichi Manyama, Dec 02 2022

Keywords

• nonn

Links

• Eric Weisstein's World of Mathematics, Spanning Tree
• Eric Weisstein's World of Mathematics, Torus Grid Graph

Crossrefs

Row 8 of A212796.

Programs

PARI

default(realprecision, 120);
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)));
a(n) = T(8, n);