The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 6 |
| 3 | 15 |
| 4 | 55 |
| 5 | 66 |
| 6 | 561 |
| 7 | 666 |
| 8 | 5151 |
| 9 | 5565 |
| 10 | 6555 |
| 11 | 55611 |
| 12 | 56616 |
| 13 | 111156 |
| 14 | 511566 |
| 15 | 565516 |
| 16 | 651511 |
| 17 | 1565565 |
| 18 | 5556111 |
| 19 | 5566116 |
| 20 | 5656566 |
| 21 | 5666661 |
| 22 | 15615666 |
| 23 | 16666651 |
| 24 | 51151555 |
| 25 | 55561611 |
| 26 | 61566156 |
| 27 | 65111166 |
| 28 | 116151661 |
| 29 | 555561111 |
| 30 | 555661116 |
| 31 | 556561566 |
| 32 | 556661661 |
[1,6,15,55,66,561,666,5151,5565,6555,55611,56616, 111156,511566,565516,651511,1565565,5556111, 5566116,5656566,5666661,15615666,16666651, 51151555,55561611,61566156,65111166,116151661, 555561111,555661116,556561566,556661661] |