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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 31 |
| 2 | 205 |
| 3 | 1379 |
| 4 | 9333 |
| 5 | 63399 |
| 6 | 431717 |
| 7 | 2944947 |
| 8 | 20115561 |
| 9 | 137543107 |
| 10 | 941258689 |
| 11 | 6445801999 |
| 12 | 44166431335 |
| 13 | 302771722951 |
| 14 | 2076414065529 |
| 15 | 14244985903467 |
| 16 | 97754711626643 |
| 17 | 671000257052461 |
| 18 | 4606822746884183 |
| 19 | 31634499742407797 |
[1,31,205,1379,9333,63399,431717,2944947,20115561, 137543107,941258689,6445801999,44166431335, 302771722951,2076414065529,14244985903467, 97754711626643,671000257052461,4606822746884183, 31634499742407797] |