On Sun, Jul 5, 2009 at 7:04 AM, June Kim<[email protected]> wrote:
>   2!_5
> 15
>   2!_6
> 21
>   _2!5
> 0
>   _2!_5
> 0
>
> It seems like Out Of's behavioral model is : 0:`(((- %&(*/) >:@] ) 
> i.)~)@.(0<[)

For positive lower number, you can use (^!._1~ % !...@[) as a model.

   2 (^!._1~ % !...@[) _5
15

Concrete mathematics defines binomials like this.

Ambrus
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