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

[Michel Marcus]

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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