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| n | a(n) |
|---|---|
| 1 | 13 |
| 2 | 209 |
| 3 | 1596 |
| 4 | 15029 |
| 5 | 140502 |
| 6 | 1281418 |
| 7 | 11937347 |
| 8 | 110090749 |
| 9 | 1017881679 |
| 10 | 9413849312 |
| 11 | 87009516622 |
| 12 | 804446182456 |
| 13 | 7437062770474 |
| 14 | 68754061673931 |
| 15 | 635629034112919 |
| 16 | 5876322569573781 |
| 17 | 54326047570786412 |
| 18 | 502239418434390677 |
[13,209,1596,15029,140502,1281418,11937347, 110090749,1017881679,9413849312,87009516622, 804446182456,7437062770474,68754061673931, 635629034112919,5876322569573781, 54326047570786412,502239418434390677] |