Witt transform examples in the OEIS
Christian G. Bower
bowerc at usa.net
Fri Aug 1 00:58:04 CEST 2008
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Hi Gangs,
Google's long-awaited Knol system is finally up and running:
http://knol.google.com/
It's a beta test version and running kinda slow,
with a big wish-list of things-to-do already,
but it looks very promising at this writing.
It's set up so that your author bio
or cv is always your first knol:
http://knol.google.com/k/jon-awbrey/jon-awbrey/3fkwvf69kridz/1
You can also shorten links after this fashion:
http://knol.google.com/k/-/-/3fkwvf69kridz/1
Here's some starticles on logic and semiotics
that I managed to whip up in just a few days:
http://knol.google.com/k/jon-awbrey/differential-logic/3fkwvf69kridz/2
http://knol.google.com/k/jon-awbrey/logical-graphs/3fkwvf69kridz/3
http://knol.google.com/k/jon-awbrey/semeiotic/3fkwvf69kridz/4
http://knol.google.com/k/jon-awbrey/logic-of-relatives/3fkwvf69kridz/5
E-joy!
Jon
CC: Arisbe, Conceptual Graphs, Corpora, Cybernetics, Inquiry, SeqFan
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Tanya asked
> Does anyone know the number of Hamiltonian cycles on a 2nx2n square
> grid of points up to isomorphism?
> If we take the cycles up to isomorphism it should start: 1, 2, ...
But it may be in the OEIS with a different description.
I guess you should work out a couple more terms!
The three most likely matches that I found were these:
%N A120443 Number of Hamiltonian paths on n X n square grid of points.
%N A003763 Number of Hamiltonian cycles on 2n X 2n square grid of points.
%C A140519 Or, number of Hamiltonian cycles in the graph P_n X P_n.
%C A140521 Or, number of directed Hamiltonian cycles in the graph P_n X P_n.
The last two are recent submissions from Don Knuth.
Best regards
Neil
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