| N FACT(N) STIR(N) Accuracy (%) | |
| 1 1 0.92213 7.78629 | |
| 2 2 1.919 4.04977 | |
| 3 6 5.8362 2.72983 | |
| 4 24 23.50617 2.0576 | |
| 5 120 118.01918 1.65067 | |
| 6 720 710.07824 1.37802 | |
| 7 5040 4980.39453 1.18264 | |
| 8 40320 39902.39843 1.03571 | |
| 9 362880 359537 0.92124 | |
| 10 3628800 3598696.75 0.82956 | |
| 11 3.99168E7 3.96156E7 0.75447 | |
| 12 4.79001E8 4.75687E8 0.69184 | |
| 13 6.22702E9 6.18723E9 0.63888 | |
| 14 8.71782E10 8.66611E10 0.59322 | |
| 15 1.30767E12 1.30043E12 0.55379 | |
| 16 2.09227E13 2.08141E13 0.51938 | |
| 17 3.55687E14 3.53948E14 0.48891 | |
| 18 6.40237E15 6.3728E15 0.46187 | |
| 19 1.21645E17 1.21112E17 0.43767 | |
| 20 2.4329E18 2.42278E18 0.41568 | |