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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 3 |
| 6 | 6 |
| 7 | 18 |
| 8 | 52 |
| 9 | 114 |
| 10 | 367 |
| 11 | 1777 |
| 12 | 5249 |
| 13 | 21107 |
| 14 | 84746 |
| 15 | 432769 |
| 16 | 10399350 |
[1,1,1,1,3,6,18,52,114,367,1777,5249,21107,84746, 432769,10399350] |