[seqfan] Re: A002955: rooted trimmed trees

[Neil Sloane]

JJ, I see you used the word "unordered" in your edit of A002955.  Did you
mean to say "unlabeled"?

And I don't understand the phrase "pre-order walk"! Could you explain?

Best regards
Neil

Neil J. A. Sloane, President, OEIS Foundation.
11 South Adelaide Avenue, Highland Park, NJ 08904, USA.
Also Visiting Scientist, Math. Dept., Rutgers University, Piscataway, NJ.
Phone: 732 828 6098; home page: http://NeilSloane.com
Email: njasloane at gmail.com


On Tue, Mar 3, 2015 at 7:03 AM, Joerg Arndt <arndt at jjj.de> wrote:

> Solved:
>
> 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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