46 characters, passes strict and -w. I wouldn't suggest running it with that sample data without Memoize, unless you have a lot of time to kill.
sub c{
my($m,$n)=@_;$n?$m?c($m-1,$n)+c($m-1,$n-1):0:1
}
Update: We can squeeze a couple more characters out of that...
sub c{
my($m,$n)=@_;$n?$m--?c($m,$n)+c($m,$n-1):0:1
}
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