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 | 3 |
| 2 | 21 |
| 3 | 123 |
| 4 | 1101 |
| 5 | 3303 |
| 6 | 23121 |
| 7 | 202023 |
| 8 | 1212201 |
| 9 | 10303203 |
| 10 | 32122221 |
| 11 | 223033323 |
| 12 | 2001233301 |
| 13 | 12011033103 |
| 14 | 102033231321 |
| 15 | 312233021223 |
| 16 | 2210031131001 |
| 17 | 13230220113003 |
| 18 | 113011321011021 |
| 19 | 1011101223033123 |