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for $n (0..10) {
  for $k (0..10) { 
    print "$n $k '.fs($n,$k)."\n"; 
    }
  }

use strict; use warnings; 

...
  my $p2=fs($n-1,$k  ); 
  return $p1 + ($k*$p2); 
}

use strict; use warnings; 

...
  my $p2=s($n-1,$k  ); 
  return $p1 + ($k*$p2); 
}

Global symbol "$p2" requires explicit package name at buk-2.pl line 30
+.
syntax error at buk-2.pl line 31, near "return"
...
Missing right curly or square bracket at buk-2.pl line 32, at end of l
+ine
syntax error at buk-2.pl line 32, at EOF
Execution of buk-2.pl aborted due to compilation errors.