[seqfan] Re: A000532

franktaw at netscape.net franktaw at netscape.net
Fri Jul 3 16:21:49 CEST 2009

OK, I've submitted an edit with those changes.  Per Richard Mather, 
I've also deleted the reference to the Moebius work.  Plus I added an 
xref to A145157.

Franklin T. Adams-Watters

-----Original Message-----
From: hv at crypt.org

franktaw at netscape.net wrote:
:It appears that this sequence ("Number of walks from NW corner of n X 
:array to SW corner.") is only counting walks that include every cell 
:the array exactly once.  Can someone verify this?  (I can't read 
:German or Chinese.)

Related sequences call such walks 'Greek-key tours'. A quick check by 
of the first 4 values certainly suggests that you are right, that these 

I have no idea what is the purpose of the comment that someone has
generated 18 values of the sequence in 3.5 hours: I would suggest also
removing that comment.


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