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| n | a(n) |
|---|---|
| 2 | 2 |
| 3 | 3 |
| 4 | 23 |
| 5 | 193 |
| 6 | 1697 |
| 7 | 15907 |
| 8 | 161773 |
| 9 | 1777543 |
| 10 | 21084257 |
| 11 | 269475737 |
| 12 | 3696588877 |
| 13 | 54223012561 |
| 14 | 847458120167 |
| 15 | 14065357995331 |
| 16 | 247134401977037 |
| 17 | 4583801628003613 |
| 18 | 89514011909036503 |
| 19 | 1836054207193376321 |
[2,3,23,193,1697,15907,161773,1777543,21084257, 269475737,3696588877,54223012561,847458120167, 14065357995331,247134401977037,4583801628003613, 89514011909036503,1836054207193376321] |