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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 29 |
| 5 | 657 |
| 6 | 61207 |
| 7 | 22168009 |
| 8 | 29875987984 |
| 9 | 155804714312491 |
| 10 | 3016989471632014921 |
| 11 | 229552430038667549657248 |
| 12 | 64995077386747098368845127628 |
| 13 | 73163996832774559516266954450479682 |
[1,1,2,5,29,657,61207,22168009,29875987984, 155804714312491,3016989471632014921, 229552430038667549657248, 64995077386747098368845127628, 73163996832774559516266954450479682] |