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

[Allan Wechsler]

The email address given for the author of that sequence is no longer active.

I found a *different *Anna Fontaine at a community college in Michigan, and
tried emailing her, but she says she's not the same person.

I think we have to hope that Neil kept notes or diagrams or something. I
can't even see 5 possibilities for a(6); I can only see 4.

On Tue, Jan 31, 2023 at 10:12 AM John Mason <masonmilan33 at gmail.com> wrote:

> Hi sequence fans
> Does anyone know what a T-frame polyomino is?
> I tried writing to the email address given in the sequence but to no avail.
> I tried identifying polyominoes that look like a T but for a(6) I found
> only 5.
> Any ideas?
> Thanks
> john
>
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