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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 55 |
| 2 | 5050 |
| 3 | 500500 |
| 4 | 50005000 |
| 5 | 5000050000 |
| 6 | 500000500000 |
| 7 | 50000005000000 |
| 8 | 5000000050000000 |
| 9 | 500000000500000000 |
| 10 | 50000000005000000000 |
| 11 | 5000000000050000000000 |
| 12 | 500000000000500000000000 |
| 13 | 50000000000005000000000000 |
| 14 | 5000000000000050000000000000 |
[1,55,5050,500500,50005000,5000050000, 500000500000,50000005000000,5000000050000000, 500000000500000000,50000000005000000000, 5000000000050000000000,500000000000500000000000, 50000000000005000000000000, 5000000000000050000000000000] |