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 | 111 |
| 4 | 121 |
| 5 | 1111 |
| 6 | 1331 |
| 7 | 11111 |
| 8 | 12321 |
| 9 | 14641 |
| 10 | 111111 |
| 11 | 161051 |
| 12 | 1111111 |
| 13 | 1234321 |
| 14 | 1367631 |
| 15 | 1771561 |
| 16 | 11111111 |
| 17 | 19487171 |
| 18 | 111111111 |
| 19 | 123454321 |
| 20 | 151807041 |
| 21 | 214358881 |
| 22 | 1111111111 |
| 23 | 1371330631 |
| 24 | 2357947691 |
| 25 | 11111111111 |