[seqfan] Re: A000532
hv at crypt.org
hv at crypt.org
Fri Jul 3 10:17:28 CEST 2009
franktaw at netscape.net wrote:
:It appears that this sequence ("Number of walks from NW corner of n X n
:array to SW corner.") is only counting walks that include every cell of
:the array exactly once. Can someone verify this? (I can't read either
:German or Chinese.)
Related sequences call such walks 'Greek-key tours'. A quick check by hand
of the first 4 values certainly suggests that you are right, that these are
tours.
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.
Hugo
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