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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 12 |
| 5 | 70 |
| 6 | 126 |
| 7 | 202 |
| 8 | 585 |
| 9 | 1592 |
| 10 | 2436 |
| 11 | 2544 |
| 12 | 4814 |
| 13 | 9603 |
| 14 | 12148 |
| 15 | 122447 |
[1,2,3,12,70,126,202,585,1592,2436,2544,4814,9603, 12148,122447] |