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| n | a(n) |
|---|---|
| 1 | 51 |
| 2 | 687 |
| 3 | 41288 |
| 4 | 1787168 |
| 5 | 67411714 |
| 6 | 2966010838 |
| 7 | 131956285636 |
| 8 | 5669387332934 |
| 9 | 243573416110820 |
| 10 | 10555475178328001 |
| 11 | 457172040211929179 |
| 12 | 19760692150060588600 |
| 13 | 854390327504135396722 |
| 14 | 36958540950287007144750 |
[51,687,41288,1787168,67411714,2966010838, 131956285636,5669387332934,243573416110820, 10555475178328001,457172040211929179, 19760692150060588600,854390327504135396722, 36958540950287007144750] |