This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 15 |
| 3 | 45 |
| 4 | 55 |
| 5 | 5151 |
| 6 | 44551 |
| 7 | 45451 |
| 8 | 1551441 |
| 9 | 51141441 |
| 10 | 51151555 |
| 11 | 114511411 |
| 12 | 4141455555 |
| 13 | 44144455545 |
| 14 | 5541155454555 |
| 15 | 54145555454451 |
| 16 | 114514415144451 |
| 17 | 455441144111551 |
| 18 | 1151514555151555 |
| 19 | 5144441415145515 |
| 20 | 45441555441511411 |
| 21 | 444441144541554111 |
| 22 | 45545414514441444141 |