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 | 11 |
| 2 | 1221 |
| 3 | 123321 |
| 4 | 12344321 |
| 5 | 1234554321 |
| 6 | 123456654321 |
| 7 | 12345677654321 |
| 8 | 1234567887654321 |
| 9 | 123456789987654321 |
| 10 | 1234567891001987654321 |
| 11 | 12345678910111101987654321 |
| 12 | 123456789101112211101987654321 |
| 13 | 1234567891011121331211101987654321 |
| 14 | 12345678910111213144131211101987654321 |