[seqfan] Re: 2 non-attacking queens on free polyonimos

[Richard Guy]

The tromino  X
              X X
doesn't admit any pair of kings ??  R.

On Fri, 27 Aug 2010, David Scambler wrote:

> Ways to place two non-attacking chess pieces on all free n-ominos. n>=1.
>
> Queens: 0,0,0,2,21,131,733,3882,19641,97282...
> Kings:  0,0,1,7,46,240,1207,6004,28903,137996...
> Rooks:  0,0,1,9,48,242,1178,5793,27651,131383...
> Wazirs: 0,0,2,14,71,341,1591,7610,35432,165209...
>
> e.g. the trionimo XXX admits 1 combination of 2 non-attacking kings or wazirs.
>
>             X
> The trionimo XX admits 1 combination of 2 non-attacking kings, rooks or wazirs.
>
>              X
> The pentomino XXXX admits 2 combinations of 2 non-attacking queens.
>
> Etc.
>
>
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