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| n | a(n) |
|---|---|
| 5 | 2 |
| 6 | 14 |
| 7 | 72 |
| 8 | 330 |
| 9 | 1430 |
| 10 | 6006 |
| 11 | 24052 |
| 12 | 100776 |
| 13 | 396800 |
| 14 | 1634380 |
| 15 | 6547520 |
[2,14,72,330,1430,6006,24052,100776,396800, 1634380,6547520] |