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

[Don Reble]

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

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

-- 
Don Reble  djr at nk.ca