[seqfan] Re: Two-fold symmetry sequence

[Benoît Jubin]

On Tue, Dec 30, 2008 at 3:11 PM, David Wilson <dwilson at gambitcomm.com> wrote:
> What are the possible symmetry groups of a polyomino?

They are the 10 subgroups of the dihedral group D_4: D_4, 1, Z_2 (five
times), Z_4, (Z_2)^2 (twice).
(for non-empty finite polyominoes)

Benoit

 Which ones does
> the OEIS count?
>
>
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