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) |
|---|---|
| 0 | 1 |
| 1 | 11 |
| 2 | 121 |
| 3 | 1001 |
| 4 | 11011 |
| 5 | 121121 |
| 6 | 1002001 |
| 7 | 11022011 |
| 8 | 121212121 |
| 9 | 1000000001 |
| 10 | 11000000011 |
| 11 | 121000000121 |
| 12 | 1001000001001 |
| 13 | 11011000011011 |
| 14 | 121121000121121 |
| 15 | 1002001001002001 |
| 16 | 11022011011022011 |
| 17 | 121212121121212121 |
| 18 | 1000000002000000001 |
| 19 | 11000000022000000011 |
| 20 | 121000000212000000121 |