OFFSET
2,1
COMMENTS
a(2) = 2^2, a(3) = 2^30 * 3^6, a(4) = 2^99 * 3^31, a(5) = 2^314 * 5^22. - Gerald McGarvey, Oct 20 2007
EXAMPLE
NumberOfSpanningTrees(L(K_2 x K_2)) = 4.
MATHEMATICA
NumberOfSpanningTrees[LineGraph[GraphProduct[CompleteGraph[n], CompleteGraph[n]]]] (* First load package DiscreteMath`Combinatorica` *)
CROSSREFS
KEYWORD
hard,nonn
AUTHOR
Roberto E. Martinez II, Jan 07 2002
EXTENSIONS
Edited by Dean Hickerson, Jan 14, 2002
STATUS
approved