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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 11 |
| 4 | 11 |
| 5 | 281 |
| 6 | 281 |
| 7 | 11181 |
| 8 | 11181 |
| 9 | 563131 |
| 10 | 563131 |
| 11 | 32795191 |
| 12 | 32795191 |
| 13 | 2103687091 |
| 14 | 2103687091 |
| 15 | 144420919291 |
| 16 | 144420919291 |
| 17 | 10421915468041 |
| 18 | 10421915468041 |
| 19 | 781300466839541 |
| 20 | 781300466839541 |
| 21 | 60358948031151561 |
| 22 | 60358948031151561 |
| 23 | 4777791013174712961 |
[1,1,11,11,281,281,11181,11181,563131,563131, 32795191,32795191,2103687091,2103687091, 144420919291,144420919291,10421915468041, 10421915468041,781300466839541,781300466839541, 60358948031151561,60358948031151561, 4777791013174712961] |