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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 15 |
| 3 | 157 |
| 4 | 1570 |
| 5 | 15707 |
| 6 | 157079 |
| 7 | 1570796 |
| 8 | 15707963 |
| 9 | 157079632 |
| 10 | 1570796326 |
| 11 | 15707963267 |
| 12 | 157079632679 |
| 13 | 1570796326794 |
| 14 | 15707963267948 |
| 15 | 157079632679489 |
| 16 | 1570796326794896 |
| 17 | 15707963267948966 |
| 18 | 157079632679489661 |
| 19 | 1570796326794896619 |
| 20 | 15707963267948966192 |
[1,15,157,1570,15707,157079,1570796,15707963, 157079632,1570796326,15707963267,157079632679, 1570796326794,15707963267948,157079632679489, 1570796326794896,15707963267948966, 157079632679489661,1570796326794896619, 15707963267948966192] |