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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 7 |
| 3 | 79 |
| 4 | 991 |
| 5 | 15621 |
| 6 | 277495 |
| 7 | 5764795 |
| 8 | 133955071 |
| 9 | 3486666301 |
| 10 | 99951163687 |
| 11 | 3138428376711 |
| 12 | 106980008889391 |
| 13 | 3937376385699277 |
| 14 | 155563347996105679 |
| 15 | 6568408050364922499 |
| 16 | 295145653362359140351 |
| 17 | 14063084452067724990993 |
| 18 | 708233993284902846818911 |
[1,7,79,991,15621,277495,5764795,133955071, 3486666301,99951163687,3138428376711, 106980008889391,3937376385699277, 155563347996105679,6568408050364922499, 295145653362359140351,14063084452067724990993, 708233993284902846818911] |