New web page for adding to an OEIS entry

N. J. A. Sloane njas at
Thu Jul 31 18:21:26 CEST 2008

Hello Seqfans,

Does anyone know the number of Hamiltonian cycles on a 2nx2n square
grid of points up to isomorphism?

I only found this sequence: A003763 Number of Hamiltonian cycles on 2n
X 2n square grid of points.  
It starts: 1, 6, 1072, 4638576, ...

If we take the cycles up to isomorphism it should start: 1, 2, ...

Is there such a sequence on the OEIS? Does anyone know the next number?

I am working on a blog entry where it would be nice to have a reference
to this sequence.

Best, Tanya Khovanova

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