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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 14 |
| 3 | 253 |
| 4 | 4508 |
| 5 | 82251 |
| 6 | 1533686 |
| 7 | 28989675 |
| 8 | 553275192 |
| 9 | 10639125640 |
| 10 | 205811431514 |
| 11 | 4000751045226 |
| 12 | 78083583349868 |
| 13 | 1529143625215220 |
| 14 | 30032524962905850 |
| 15 | 591315394579074378 |
| 16 | 11667877650711051896 |
| 17 | 230672804560960311000 |
| 18 | 4568131162533134953328 |
[1,1,14,253,4508,82251,1533686,28989675,553275192, 10639125640,205811431514,4000751045226, 78083583349868,1529143625215220,30032524962905850, 591315394579074378,11667877650711051896, 230672804560960311000,4568131162533134953328] |