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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 31 |
| 3 | 617 |
| 4 | 18529 |
| 5 | 748859 |
| 6 | 38149567 |
| 7 | 2348482961 |
| 8 | 169641143873 |
| 9 | 14071599763379 |
| 10 | 1318414335714015 |
| 11 | 137720427724123513 |
| 12 | 15871136311527376801 |
| 13 | 2000355821099358166891 |
| 14 | 273735526097742996298111 |
| 15 | 40419227378551955037029921 |
| 16 | 6405616571975691389276400257 |
[1,3,31,617,18529,748859,38149567,2348482961, 169641143873,14071599763379,1318414335714015, 137720427724123513,15871136311527376801, 2000355821099358166891,273735526097742996298111, 40419227378551955037029921, 6405616571975691389276400257] |