Combinatorica`
Combinatorica`
NumberOfSpanningTrees
As of Version 10, most of the functionality of the Combinatorica package is built into the Wolfram System. »
NumberOfSpanningTrees[g]
gives the number of labeled spanning trees of graph 
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Details and Options
- To use NumberOfSpanningTrees, you first need to load the Combinatorica Package using Needs["Combinatorica`"].
Wolfram Research (2012), NumberOfSpanningTrees, Wolfram Language function, https://reference.wolfram.com/language/Combinatorica/ref/NumberOfSpanningTrees.html.
Text
Wolfram Research (2012), NumberOfSpanningTrees, Wolfram Language function, https://reference.wolfram.com/language/Combinatorica/ref/NumberOfSpanningTrees.html.
CMS
Wolfram Language. 2012. "NumberOfSpanningTrees." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/Combinatorica/ref/NumberOfSpanningTrees.html.
APA
Wolfram Language. (2012). NumberOfSpanningTrees. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/Combinatorica/ref/NumberOfSpanningTrees.html