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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 17 |
| 3 | 136 |
| 4 | 1091 |
| 5 | 8730 |
| 6 | 69841 |
| 7 | 558728 |
| 8 | 4469827 |
| 9 | 35758618 |
| 10 | 286068945 |
| 11 | 2288551560 |
| 12 | 18308412483 |
| 13 | 146467299866 |
| 14 | 1171738398929 |
| 15 | 9373907191432 |
| 16 | 74991257531459 |
| 17 | 599930060251674 |
| 18 | 4799440482013393 |
[2,17,136,1091,8730,69841,558728,4469827,35758618, 286068945,2288551560,18308412483,146467299866, 1171738398929,9373907191432,74991257531459, 599930060251674,4799440482013393] |