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

[David Radcliffe]

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
>
>
>
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