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

[Allan Wechsler]

I bet that solves the problem! John, try enumerating polyominoes which are
integral rectangles with integral notches cut from two adjacent corners.

On Tue, Jan 31, 2023 at 11:13 AM Michel Marcus <michel.marcus183 at gmail.com>
wrote:

> There are U-frames in https://doi.org/10.1016/0097-3165(91)90013-7.
> Best .
> MM
>
> Le mar. 31 janv. 2023 à 16:12, John Mason <masonmilan33 at gmail.com> a
> écrit :
>
> > 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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> >
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