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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 3 |
| 3 | 11 |
| 4 | 27 |
| 5 | 270 |
| 6 | 4366 |
| 7 | 82491 |
| 8 | 1762107 |
| 9 | 135979835 |
| 10 | 10135979835 |
| 11 | 753144350523 |
| 12 | 130499482241148 |
| 13 | 20953464347912316 |
| 14 | 6242774737775732860 |
| 15 | 2960555481288609431503 |
| 16 | 1211886375095917784137679 |
| 17 | 719537152598665509899534287 |
| 18 | 851154233276178632011679465423 |
[1,2,3,11,27,270,4366,82491,1762107,135979835, 10135979835,753144350523,130499482241148, 20953464347912316,6242774737775732860, 2960555481288609431503,1211886375095917784137679, 719537152598665509899534287, 851154233276178632011679465423] |