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A358814
Number of spanning trees in C_9 X C_n.
1
9, 34928082, 5312031978672, 344499209234302500, 16463182598208445194045, 687776414074843514847584256, 26818349084747196820449212376063, 1005049441217682470864686231147005000, 36735015407753190053984060991247792275456
OFFSET
1,1
LINKS
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(9, n);
CROSSREFS
Row 9 of A212796.
Sequence in context: A131678 A229687 A029983 * A225775 A154110 A235400
KEYWORD
nonn
AUTHOR
Seiichi Manyama, Dec 02 2022
STATUS
approved