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A000243
Number of trees with n nodes, 2 of which are labeled.
(Formerly M2803 N1128)
+0
9
1, 3, 9, 26, 75, 214, 612, 1747, 4995, 14294, 40967, 117560, 337830, 972027, 2800210, 8075889, 23315775, 67380458, 194901273, 564239262, 1634763697, 4739866803, 13752309730, 39926751310, 115988095896, 337138003197
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Maintained by
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Last modified December 2 11:54 EST 2009. Contains 167921 sequences.
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