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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 31 |
| 4 | 623 |
| 5 | 20641 |
| 6 | 1019051 |
| 7 | 70148989 |
| 8 | 6421463423 |
| 9 | 754405836811 |
| 10 | 110644077164479 |
| 11 | 19814920352425441 |
| 12 | 4255291684449288503 |
| 13 | 1079391696218976473971 |
| 14 | 319292229636452654327115 |
| 15 | 108942069149956119095870401 |
| 16 | 42469095372194594340983910271 |
| 17 | 18758916770545140042717283889713 |
[1,1,3,31,623,20641,1019051,70148989,6421463423, 754405836811,110644077164479,19814920352425441, 4255291684449288503,1079391696218976473971, 319292229636452654327115, 108942069149956119095870401, 42469095372194594340983910271, 18758916770545140042717283889713] |