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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 35 |
| 4 | 135 |
| 5 | 1755 |
| 6 | 6303 |
| 7 | 39815 |
| 8 | 132675 |
| 9 | 3322515 |
| 10 | 10561455 |
| 11 | 64566253 |
| 12 | 199681945 |
| 13 | 2391238415 |
| 14 | 7233344915 |
[1,1,5,35,135,1755,6303,39815,132675,3322515, 10561455,64566253,199681945,2391238415,7233344915] |