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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 5 |
| 3 | 37 |
| 4 | 355 |
| 5 | 3595 |
| 6 | 41962 |
| 7 | 486633 |
| 8 | 5896400 |
| 9 | 75009913 |
| 10 | 947911584 |
| 11 | 12153660815 |
| 12 | 161974729738 |
[1,5,37,355,3595,41962,486633,5896400,75009913, 947911584,12153660815,161974729738] |