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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 31 |
| 2 | 499 |
| 3 | 6691 |
| 4 | 103999 |
| 5 | 1650331 |
| 6 | 26785795 |
| 7 | 440527111 |
| 8 | 7314819751 |
| 9 | 122278421227 |
| 10 | 2053842141979 |
| 11 | 34613678967855 |
| 12 | 584736268675807 |
| 13 | 9894571943140955 |
| 14 | 167626169017722627 |
| 15 | 2842115774310107311 |
[1,31,499,6691,103999,1650331,26785795,440527111, 7314819751,122278421227,2053842141979, 34613678967855,584736268675807,9894571943140955, 167626169017722627,2842115774310107311] |