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| n | a(n) |
|---|---|
| 1 | 7 |
| 2 | 19 |
| 3 | 79 |
| 4 | 491 |
| 5 | 2153 |
| 6 | 8123 |
| 7 | 8123 |
| 8 | 66137 |
| 9 | 749467 |
| 10 | 24935909 |
| 11 | 128200879 |
| 12 | 128200883 |
| 13 | 7256916503 |
| 14 | 61070523827 |
| 15 | 181066533587 |
| 16 | 1940791472069 |
| 17 | 12233504578289 |
| 18 | 274988895429719 |
[7,19,79,491,2153,8123,8123,66137,749467,24935909, 128200879,128200883,7256916503,61070523827, 181066533587,1940791472069,12233504578289, 274988895429719] |