Piled polyominos

[franktaw at netscape.net]

OK, I was missing one of the tetracubes.  This changes my last four 
sequences:

>There are 4 sequences of piled 3D polys that need extending:
>
>allowing only planar rotations:
>
>1,2,4,15

1,2,4,17

>allowing arbitrary planar transformations:
>
>1,2,3,12

1,2,3,13

>allowing spatial rotations:
>
>1,1,2,8

1,1,2,9

>and allowing arbitrary isometric transformations:
>
>1,1,2,7

1,1,2,8

>These clearly need more terms.

-----Original Message-----
From: Joseph S. Myers <jsm at polyomino.org.uk>
To: franktaw at netscape.net
Cc: seqfan at ext.jussieu.fr
Sent: Sat, 15 Oct 2005 18:36:13 +0000 (UTC)
Subject: Re: Fwd: Piled polyominos

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

__________________________________________________________________
Look What The New Netscape.com Can Do!
Now you can preview dozens of stories and have the ones you select 
delivered to you without ever leaving the Top Home Page. And the new 
Tool Box gives you one click access to local Movie times, Maps, White 
Pages and more.  See for yourself at 
http://netcenter.netscape.com/netcenter/