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 | 0 |
| 1 | 1 |
| 2 | 22 |
| 3 | 333 |
| 4 | 4444 |
| 5 | 55555 |
| 6 | 666666 |
| 7 | 7777777 |
| 8 | 88888888 |
| 9 | 999999999 |
| 10 | 11111111110 |
| 11 | 122222222221 |
| 12 | 1333333333332 |
| 13 | 14444444444443 |
| 14 | 155555555555554 |
| 15 | 1666666666666665 |
| 16 | 17777777777777776 |
| 17 | 188888888888888887 |
| 18 | 1999999999999999998 |
| 19 | 21111111111111111109 |
| 20 | 222222222222222222220 |
| 21 | 2333333333333333333331 |