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A000673 Number of bicentered 3-valent (or boron, or binary) trees with n nodes.
(Formerly M0355 N0133)
+0
3
0, 0, 1, 0, 1, 1, 2, 2, 6, 8, 18, 30, 67, 127, 275, 551, 1192, 2507, 5475, 11820, 26007, 57077, 126686, 281625, 630660, 1416116, 3195784, 7232624, 16430563, 37429146, 85528079, 195940960, 450074270, 1036226173, 2391193488, 5529420585 (list; graph; listen)
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Last modified December 7 23:50 EST 2009. Contains 170430 sequences.


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