[seqfan] Re: A002955: rooted trimmed trees

Joerg Arndt arndt at jjj.de
Tue Mar 3 13:03:16 CET 2015


The first comment should really be
  "A rooted trimmed tree is a tree without limbs of length >= 2."
My confusion was caused by the current wording
  "A rooted trimmed tree is a tree with a forbidden limb of length 2."
plus errors in my programming.

The observation that the sequence also counts
  "Unordered rooted trees without "x x" in the level
   sequence for the pre-order walk."
still stands.

I will edit the sequence.

Best regards,   Joerg

* Joerg Arndt <arndt at jjj.de> [Mar 02. 2015 18:54]:
> [...]

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