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 | 1 |
| 2 | 21 |
| 3 | 1221 |
| 4 | 3231 |
| 5 | 233231 |
| 6 | 533221 |
| 7 | 15534221 |
| 8 | 3514334231 |
| 9 | 3534533241 |
| 10 | 3544832231 |
| 11 | 183544733221 |
| 12 | 28172544634231 |
| 13 | 2827162554535241 |
| 14 | 2827265554337241 |
| 15 | 2837267544338231 |
| 16 | 3847264544637221 |
| 17 | 3847362564636221 |
| 18 | 2837662564536221 |
| 19 | 2827863534537221 |
| 20 | 3837564524538221 |