[seqfan] Re: a sequence idea: polyominoes with unique domino tiling

[Joseph S. Myers]

On Tue, 5 Jun 2012, Tanya Khovanova wrote:

> I suggest a sequence: a(n) is the number of polyominoes of size 2n that 
> have a unique domino tiling. I think it starts 1,3,20. But I do not know 
> if it is in the OEIS or not.

I've created A213377 for this (along with A213376, polyominoes of order 2n 
that cannot be tiled by dominoes, A213378, those with more than one domino 
tiling, and an extension to A056785, those with at least one domino 
tiling).

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