A358811 Number of spanning trees in C_6 X C_n.

6, 117600, 292626432, 428652000000, 522217835532030, 587312954081280000, 633426582213424399722, 665880333340217184000000, 687776414074843514847584256, 701129416495732552572667500000, 707405677027691828669857196745186

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 6 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(6, n);