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

Don Reble djr at nk.ca
Wed Feb 1 23:07:22 CET 2023

> Don. For a(8) I think you're missing
> OOO_
> __O_

    Thank you, John. I was mis-discounting symmetrics;
    now I confirm the author's data.

Don Reble  djr at nk.ca

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