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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 45 |
| 3 | 203 |
| 4 | 1401 |
| 5 | 8664 |
| 6 | 55624 |
| 7 | 349273 |
| 8 | 2229806 |
| 9 | 14141138 |
| 10 | 89782352 |
| 11 | 570414504 |
| 12 | 3623364042 |
| 13 | 23013173083 |
| 14 | 146192778743 |
| 15 | 928659809148 |
| 16 | 5899066377892 |
| 17 | 37473134952091 |
| 18 | 238043423305307 |
| 19 | 1512137758273339 |
| 20 | 9605680030690948 |
[2,45,203,1401,8664,55624,349273,2229806,14141138, 89782352,570414504,3623364042,23013173083, 146192778743,928659809148,5899066377892, 37473134952091,238043423305307,1512137758273339, 9605680030690948] |