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 | 11 |
| 3 | 11 |
| 4 | 111 |
| 5 | 1221 |
| 6 | 1221 |
| 7 | 12221 |
| 8 | 123321 |
| 9 | 1356531 |
| 10 | 1356531 |
| 11 | 13566531 |
| 12 | 135787531 |
| 13 | 1370219631 |
| 14 | 15072415941 |
| 15 | 15072415941 |
| 16 | 150725515941 |
| 17 | 1507390825941 |
| 18 | 15087488356941 |
| 19 | 152246473420041 |
| 20 | 1674711207620451 |
| 21 | 1674711207620451 |