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 | 127 |
| 3 | 1231 |
| 4 | 12343 |
| 5 | 123457 |
| 6 | 12345623 |
| 7 | 123456719 |
| 8 | 1234567801 |
| 9 | 1234567891 |
| 10 | 1234567891003 |
| 11 | 12345678910111 |
| 12 | 12345678910111207 |
| 13 | 1234567891011121309 |
| 14 | 123456789101112131449 |
| 15 | 12345678910111213141523 |
| 16 | 123456789101112131415161 |
| 17 | 123456789101112131415161717 |