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A003092 Number of labeled plane 2-trees with n nodes.
(Formerly M2159)
+0
1
0, 1, 2, 36, 1200, 57000, 3477600, 257826240, 22438563840, 2238543216000, 251584613280000, 31431367287936000, 4319334744012288000, 647313578549730892800, 105041172967733882880000, 18345770194541665075200000, 3430869798262479024291840000 (list; graph; listen)
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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.


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