| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 11 |
| 3 | 111 |
| 4 | 337 |
| 5 | 1337 |
| 6 | 7191 |
| 7 | 51141 |
| 8 | 317047 |
| 9 | 1317047 |
| 10 | 2814687 |
| 11 | 9312743 |
| 12 | 25193697 |
| 13 | 30981533 |
| 14 | 51496017 |
| 15 | 192326779 |
| 16 | 1427134777 |
| 17 | 4987286171 |
| 18 | 6471777063 |
| 19 | 61653104971 |
| 20 | 259323776747 |
| 21 | 737046253821 |
| 22 | 7171027958513 |
| 23 | 31727922601647 |
[1,11,111,337,1337,7191,51141,317047,1317047, 2814687,9312743,25193697,30981533,51496017, 192326779,1427134777,4987286171,6471777063, 61653104971,259323776747,737046253821, 7171027958513,31727922601647] |