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 | 111111111 |
| 2 | 222222222 |
| 3 | 333333333 |
| 4 | 444444444 |
| 5 | 555555555 |
| 6 | 666666666 |
| 7 | 777777777 |
| 8 | 888888888 |
| 9 | 999999999 |
| 10 | 1111111110 |
| 11 | 1222222221 |
| 12 | 1333333332 |
| 13 | 1444444443 |
| 14 | 1555555554 |
| 15 | 1666666665 |
| 16 | 1777777776 |
| 17 | 1888888887 |
| 18 | 1999999998 |
| 19 | 2111111109 |
| 20 | 2222222220 |
| 21 | 2333333331 |
| 22 | 2444444442 |
| 23 | 2555555553 |