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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 13 |
| 3 | 113 |
| 4 | 1113 |
| 5 | 2153 |
| 6 | 12153 |
| 7 | 34051 |
| 8 | 172003 |
| 9 | 1311313 |
| 10 | 3473779 |
| 11 | 5365543 |
| 12 | 16913173 |
| 13 | 34014973 |
| 14 | 229148537 |
| 15 | 479347809 |
| 16 | 1807726517 |
| 17 | 11807726517 |
| 18 | 20529575173 |
| 19 | 69833293981 |
| 20 | 179443389167 |
| 21 | 230839777353 |
| 22 | 376946592451 |
[3,13,113,1113,2153,12153,34051,172003,1311313, 3473779,5365543,16913173,34014973,229148537, 479347809,1807726517,11807726517,20529575173, 69833293981,179443389167,230839777353, 376946592451] |