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| n | a(n) |
|---|---|
| 2 | 1 |
| 3 | 9 |
| 4 | 486 |
| 5 | 26230 |
| 6 | 2658825 |
| 7 | 303936255 |
| 8 | 29022562044 |
| 9 | 2546840675268 |
| 10 | 209628417451815 |
| 11 | 15863225333113455 |
| 12 | 1100628488842991790 |
| 13 | 71323826984704710078 |
| 14 | 4440654868991991482287 |
| 15 | 268844012960749492143465 |
[1,9,486,26230,2658825,303936255,29022562044, 2546840675268,209628417451815,15863225333113455, 1100628488842991790,71323826984704710078, 4440654868991991482287,268844012960749492143465] |