N    FACT(N)      STIR(N)      Accuracy (%)
1    1            0.922137     7.7863      
2    2            1.919        4.04978     
3    6            5.83621      2.72984     
4    24           23.5062      2.0576      
5    120          118.019      1.65068     
6    720          710.078      1.37802     
7    5040         4980.39      1.18265     
8    40320        39902.4      1.03572     
9    362880       359537       0.921241    
10   3628800      3.5987e+06   0.829565    
11   3.99168e+07  3.96156e+07  0.754479    
12   4.79002e+08  4.75688e+08  0.691846    
13   6.22702e+09  6.18724e+09  0.638884    
14   8.71783e+10  8.66611e+10  0.593222    
15   1.30767e+12  1.30043e+12  0.553797    
16   2.09228e+13  2.08141e+13  0.519387    
17   3.55687e+14  3.53948e+14  0.48891     
18   6.40237e+15  6.3728e+15   0.461873    
19   1.21645e+17  1.21113e+17  0.437677    
20   2.4329e+18   2.42279e+18  0.415689