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| n | a(n) |
|---|---|
| 1 | 55 |
| 2 | 51015 |
| 3 | 554455 |
| 4 | 51488415 |
| 5 | 510151015 |
| 6 | 55883648705050784638855 |
| 7 | 531578379527444725973875135 |
[55,51015,554455,51488415,510151015, 55883648705050784638855, 531578379527444725973875135] |