[seqfan] Re: polyominos

[Sean A. Irvine]

A030222.


On Mon, Sep 29, 2014 at 8:51 AM, David Newman <davidsnewman at gmail.com> wrote:
> There are lots of sequences in the OEIS related to polyominos constructed
> by joining squares at their edges.  Are there sequences counting the number
> of shapes where squares may be joined at their corners as well as at their
> edges? I've counted such shapes by hand and gotten 1,2,5,19, but this is
> not enough information to narrow down the list of possibilities.  I suspect
> that someone may have counted these objects before and don't want to put in
> the time to write a program to count them if it's already been done.  Does
> anyone know if this has been done before?
>
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