Fwd: Piled polyominos

[Joseph S. Myers]

On Sat, 15 Oct 2005, franktaw at netscape.net wrote:

> I wanted to add a reference to the sequence for fixed polycubes, but it 
> doesn't appear to be in the database!  It starts:
>  
> 1,3,15,74
>  
> Surely somebody can extend this one.

It actually seems to start

1,3,15,86,534,3481,23502,162913,1152870,8294738,60494549

which shows it is in the database as A001931.

-- 
Joseph S. Myers
jsm at polyomino.org.uk