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| n | a(n) |
|---|---|
| 1 | 7 |
| 2 | 19 |
| 3 | 131 |
| 4 | 719 |
| 5 | 17863 |
| 6 | 84017 |
| 7 | 1742537 |
| 8 | 7754077 |
| 9 | 148948139 |
| 10 | 11891268401 |
| 11 | 50685770167 |
| 12 | 3839726846311 |
| 13 | 67756520645329 |
| 14 | 283634652716357 |
| 15 | 4940729268330643 |
| 16 | 354733509412061993 |
| 17 | 25161232392544176197 |
| 18 | 103917116257220706127 |
| 19 | 7278050150447936843717 |
| 20 | 123129946710886829498713 |
| 21 | 505870764273226657981427 |
[7,19,131,719,17863,84017,1742537,7754077, 148948139,11891268401,50685770167,3839726846311, 67756520645329,283634652716357,4940729268330643, 354733509412061993,25161232392544176197, 103917116257220706127,7278050150447936843717, 123129946710886829498713,505870764273226657981427] |