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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 11 |
| 4 | 61 |
| 5 | 379 |
| 6 | 2731 |
| 7 | 22301 |
| 8 | 203897 |
| 9 | 2064455 |
| 10 | 22938391 |
| 11 | 277554529 |
| 12 | 3633441109 |
| 13 | 51170962283 |
| 14 | 771500662115 |
| 15 | 12399117783989 |
| 16 | 211611610180081 |
| 17 | 3822234708877711 |
| 18 | 72847296804492847 |
| 19 | 1460993008134550985 |
[1,3,11,61,379,2731,22301,203897,2064455,22938391, 277554529,3633441109,51170962283,771500662115, 12399117783989,211611610180081,3822234708877711, 72847296804492847,1460993008134550985] |