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A000672 Number of 3-valent trees (= boron trees or binary trees) with n nodes.
(Formerly M0326 N0122)
+0
4
1, 1, 1, 1, 2, 2, 4, 6, 11, 18, 37, 66, 135, 265, 552, 1132, 2410, 5098, 11020, 23846, 52233, 114796, 254371, 565734, 1265579, 2841632, 6408674, 14502229, 32935002, 75021750, 171404424, 392658842, 901842517, 2076217086, 4790669518, 11077270335 (list; graph; listen)
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Last modified December 6 22:55 EST 2009. Contains 170429 sequences.


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