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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 5 |
| 2 | 25 |
| 3 | 193 |
| 4 | 1729 |
| 5 | 17281 |
| 6 | 207361 |
| 7 | 2903041 |
| 8 | 43545601 |
| 9 | 696729601 |
| 10 | 12541132801 |
| 11 | 250822656001 |
| 12 | 5267275776001 |
| 13 | 115880067072001 |
| 14 | 2781121609728001 |
| 15 | 69528040243200001 |
| 16 | 1807729046323200001 |
| 17 | 48808684250726400001 |
| 18 | 1366643159020339200001 |
[2,5,25,193,1729,17281,207361,2903041,43545601, 696729601,12541132801,250822656001,5267275776001, 115880067072001,2781121609728001, 69528040243200001,1807729046323200001, 48808684250726400001,1366643159020339200001] |