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 | 5 |
| 1 | 15 |
| 2 | 1511 |
| 3 | 211511 |
| 4 | 21152112 |
| 5 | 122112152112 |
| 6 | 122112151112212211 |
| 7 | 2122112231151112212211 |
| 8 | 21221122311521132221221112 |
| 9 | 12312211321321121521132221221112 |