The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 28 |
| 2 | 55 |
| 3 | 528 |
| 4 | 255255 |
| 5 | 525825 |
| 6 | 828828 |
| 7 | 22528828 |
| 8 | 58855825 |
| 9 | 88252255 |
| 10 | 285258555 |
| 11 | 252852582885 |
| 12 | 255285258288528 |
| 13 | 255828252825225 |
| 14 | 825882525828828 |
| 15 | 255888285855228855 |
| 16 | 555888585855288828885 |
| 17 | 55255285258252252552225 |
| 18 | 282882828558888582552522225 |
| 19 | 528225588525528822525588858528585 |
[28,55,528,255255,525825,828828,22528828,58855825, 88252255,285258555,252852582885,255285258288528, 255828252825225,825882525828828, 255888285855228855,555888585855288828885, 55255285258252252552225, 282882828558888582552522225, 528225588525528822525588858528585] |