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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 34 |
| 5 | 167 |
| 6 | 1006 |
| 7 | 6095 |
| 8 | 38740 |
| 9 | 248882 |
| 10 | 1626010 |
| 11 | 10721484 |
| 12 | 71325224 |
| 13 | 477718720 |
| 14 | 3218795537 |
[1,2,6,34,167,1006,6095,38740,248882,1626010, 10721484,71325224,477718720,3218795537] |