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A358812
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Number of spanning trees in C_7 X C_n.
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1
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7, 799694, 7839321861, 40643137651228, 168437773747672835, 633426582213424399722, 2266101334892340404752384, 7871822605982542067643202616, 26818349084747196820449212376063, 90098172307754257628918141363625670, 299464785482715726798502702429093755197
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OFFSET
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1,1
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LINKS
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PROG
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(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(7, n);
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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