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| n | a(n) |
|---|---|
| 1 | 561 |
| 2 | 1729 |
| 3 | 41041 |
| 4 | 1615681 |
| 5 | 14676481 |
| 6 | 40622401 |
| 7 | 173085121 |
| 8 | 367804801 |
| 9 | 631071001 |
| 10 | 8494657921 |
| 11 | 138399075361 |
| 12 | 432081216001 |
| 13 | 997803878401 |
| 14 | 3837165696001 |
| 15 | 7599525373441 |
| 16 | 42182344790209 |
| 17 | 65032633451521 |
| 18 | 186137387251201 |
| 19 | 329797704600001 |
| 20 | 2523853463040001 |
[561,1729,41041,1615681,14676481,40622401, 173085121,367804801,631071001,8494657921, 138399075361,432081216001,997803878401, 3837165696001,7599525373441,42182344790209, 65032633451521,186137387251201,329797704600001, 2523853463040001] |