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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 6 |
| 3 | 35 |
| 4 | 330 |
| 5 | 4368 |
| 6 | 74613 |
| 7 | 1560780 |
| 8 | 38608020 |
| 9 | 1101716330 |
| 10 | 35607051480 |
| 11 | 1285063345176 |
| 12 | 51209646652255 |
| 13 | 2232785266876080 |
| 14 | 105710363656182600 |
| 15 | 5399936810873056584 |
| 16 | 295998326072989842600 |
| 17 | 17328840976366636057110 |
[1,2,6,35,330,4368,74613,1560780,38608020, 1101716330,35607051480,1285063345176, 51209646652255,2232785266876080, 105710363656182600,5399936810873056584, 295998326072989842600,17328840976366636057110] |