[seqfan] Re: Help with A028247 Number of T-frame polyominoes with n cells

[John Mason]

David
That's ok; I will add my edits to what you already did.
john

On Sat, Feb 4, 2023 at 4:58 AM David Radcliffe <dradcliffe at gmail.com> wrote:

> I accidentally reverted the proposed changes to the sequence. I clicked the
> wrong button because I thought that I was only reverting my own changes. My
> apologies.
>
> - David
>
> On Wed, Feb 1, 2023 at 8:31 PM Don Reble via SeqFan <seqfan at list.seqfan.eu
> >
> wrote:
>
> > > I wonder whether A028247 ought to be extended backward to note that
> > > there are 0 examples for n=1, 2, and 3.
> >
> >      Yes: a(1)=0, not "undefined".
> >
> > > Does a similar sequence to A028247 exist for "L-frame" polyominoes?
> >
> >      A270060
> >
> > --
> > Don Reble  djr at nk.ca
> >
> >
> >
> > --
> > Seqfan Mailing list - http://list.seqfan.eu/
> >
>
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