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| n | a(n) |
|---|---|
| 1 | 7 |
| 2 | 49 |
| 3 | 331 |
| 4 | 2137 |
| 5 | 13147 |
| 6 | 77449 |
| 7 | 440251 |
| 8 | 2432857 |
| 9 | 13151707 |
| 10 | 69895849 |
| 11 | 366600571 |
| 12 | 1903222777 |
| 13 | 9802234267 |
| 14 | 50171448649 |
| 15 | 255545887291 |
| 16 | 1296626911897 |
| 17 | 6559153748827 |
| 18 | 33101134543849 |
| 19 | 166731005404411 |
| 20 | 838567970940217 |
| 21 | 4212526479343387 |
| 22 | 21141483461069449 |
[7,49,331,2137,13147,77449,440251,2432857, 13151707,69895849,366600571,1903222777,9802234267, 50171448649,255545887291,1296626911897, 6559153748827,33101134543849,166731005404411, 838567970940217,4212526479343387, 21141483461069449] |