This method calculates the Narumi-Katayama index.
a graph as a graphNEL object.
the degree of each node of g. Will be automatically calculated if not supplied.
This method returns the Narumi-Katayama index of a graph as an integer value.
Lavanya Sivakumar, Michael Schutte
H. Narumi and M. Katayama: Simple topological index. A newly devised index characterizing the topological nature of structural isomers of saturated hydrocarbons. Mem. Fac. Engin. Hokkaido Univ., 16:209, 1984
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