A358815 Number of spanning trees in C_10 X C_n.

10, 226195360, 135495143785470, 31074298464967845120, 5040439500800000000000000, 701129416495732552572667500000, 90098172307754257628918141363625670, 11062145603354190616166421646710839715840

Offset

1,1

Links

Table of n, a(n) for n=1..8.

Eric Weisstein's World of Mathematics, Spanning Tree

Eric Weisstein's World of Mathematics, Torus Grid Graph

Prog

(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(10, n);

Crossrefs

Row 10 of A212796.

Sequence in context: A220145 A057141 A034249 * A131679 A259391 A279540

Adjacent sequences: A358812 A358813 A358814 * A358816 A358817 A358818

Keyword

nonn

Author

Seiichi Manyama, Dec 02 2022

Status

approved