Witt transform examples in the OEIS

[Christian G. Bower]

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Hi Gangs,

Google's long-awaited Knol system is finally up and running:

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with a big wish-list of things-to-do already,
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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