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A086314
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Total number of edges in the distinct simple graphs on n nodes.
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2
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0, 1, 6, 33, 170, 1170, 10962, 172844, 4944024, 270116280, 28022441260, 5448008695536, 1969579223350128, 1321964082404214704, 1649890513414726210320, 3840060942271653473695680, 16723638762440239422492944768, 136749695973639295091912681599872
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OFFSET
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1,3
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COMMENTS
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LINKS
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MATHEMATICA
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<< Combinatorica`; Table[D[GraphPolynomial[n, x], x] /. x -> 1, {n, 18}] (* Geoffrey Critzer, Sep 29 2012 *)
<< Combinatorica`; Table[Binomial[n, 2] NumberOfGraphs[n]/2, {n, 18}] (* Eric W. Weisstein, May 17 2017 *)
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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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