Number of asymmetric trees with n nodes (also called identity trees).
1, 0, 0, 0, 0, 0, 1, 1, 3, 6, 15, 29, 67, 139, 310, 667, 1480, 3244, 7241, 16104, 36192
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Fri Oct 29 05:35:16 CEST 2010 [seqfan] Implementing first 500 sequences in Java