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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 13 |
| 3 | 31 |
| 4 | 129 |
| 5 | 29180479 |
| 6 | 121378881 |
| 7 | 110778874246369293 |
| 8 | 263631110418336671 |
| 9 | 95129083120198558843838970225921 |
| 10 | 213007829848951141529011991896053267187 |
[3,13,31,129,29180479,121378881, 110778874246369293,263631110418336671, 95129083120198558843838970225921, 213007829848951141529011991896053267187] |