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| n | a(n) |
|---|---|
| 2 | 4 |
| 3 | 64 |
| 4 | 225 |
| 5 | 5329 |
| 6 | 38025 |
| 7 | 314721 |
| 8 | 3111696 |
| 9 | 61058596 |
| 10 | 1026753849 |
| 11 | 31529329225 |
| 12 | 892067027049 |
| 13 | 307197306432025 |
| 14 | 803752551280900 |
| 15 | 29501156485626049 |
| 16 | 1163446635475467225 |
| 17 | 830482914641378019961 |
| 18 | 2200667320658951859841 |
| 19 | 104753558229986901966129 |
| 20 | 5272187100814113874556176 |
[4,64,225,5329,38025,314721,3111696,61058596, 1026753849,31529329225,892067027049, 307197306432025,803752551280900,29501156485626049, 1163446635475467225,830482914641378019961, 2200667320658951859841,104753558229986901966129, 5272187100814113874556176] |