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A061575
Number of planar planted trees with n non-root nodes and without isolated 2-valent nodes.
+0
1
0, 1, 0, 2, 2, 7, 14, 41, 107, 307, 871, 2546, 7497, 22380, 67366, 204517, 625132, 1922700, 5945469, 18473841, 57649699, 180602285, 567772883, 1790663427, 5663969707, 17963483548, 57112388657, 181994536484, 581168157605
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Maintained by
N. J. A. Sloane
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Last modified December 16 17:18 EST 2009. Contains 170825 sequences.
AT&T Labs Research
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