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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 5 |
| 4 | 29 |
| 5 | 145 |
| 6 | 957 |
| 7 | 8397 |
| 8 | 85169 |
| 9 | 944221 |
| 10 | 11639417 |
| 11 | 160699437 |
| 12 | 2430145085 |
| 13 | 39776366397 |
| 14 | 703161838717 |
| 15 | 13369111112753 |
| 16 | 271734091323897 |
[1,1,1,5,29,145,957,8397,85169,944221,11639417, 160699437,2430145085,39776366397,703161838717, 13369111112753,271734091323897] |