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| n | a(n) |
|---|---|
| 1 | 7 |
| 2 | 13 |
| 3 | 19 |
| 4 | 41 |
| 5 | 223 |
| 6 | 487 |
| 7 | 1201 |
| 8 | 1301 |
| 9 | 18493 |
| 10 | 32009 |
| 11 | 110237 |
| 12 | 282001 |
| 13 | 1039681 |
| 14 | 2380531 |
| 15 | 96799849 |
| 16 | 1012639687 |
| 17 | 4999900001 |
| 18 | 19976430247 |
| 19 | 20544050201 |
| 20 | 109860000049 |
[7,13,19,41,223,487,1201,1301,18493,32009,110237, 282001,1039681,2380531,96799849,1012639687, 4999900001,19976430247,20544050201,109860000049] |