[seqfan] Help needed with A007863 Number of hybrid binary trees with n nodes.
David Scambler
dscambler at bmm.com
Fri May 18 04:31:55 CEST 2012
https://oeis.org/A007863
I am not sure what the hybrid binary trees are.
For example, what are the 7 trees counted by a(2) = 7?
Thanks
dave
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