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 | 0 |
| 2 | 22 |
| 3 | 44 |
| 4 | 66 |
| 5 | 88 |
| 6 | 1111 |
| 7 | 1661 |
| 8 | 1771 |
| 9 | 1881 |
| 10 | 1991 |
| 11 | 2662 |
| 12 | 2772 |
| 13 | 4444 |
| 14 | 2882 |
| 15 | 2992 |
| 16 | 3773 |