counting Sudoku _problems_

[Franklin T. Adams-Watters]

Another sequence of interest would be to look for *minimal* problems - ones where removing any more numbers would result in there no longer being a unique solution.

hv at crypt.org wrote:
>:The recent sequences have all considered grids that could appear
>:as the _answer_ to a Sudoku problem. Another interesting question
>:is how many grids could appear as the _problem_, with the proviso
>:that such a problem must lead to a unique solution.
-- 
Franklin T. Adams-Watters
16 W. Michigan Ave.
Palatine, IL 60067
847-776-7645


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