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 | 2 |
| 2 | 22 |
| 3 | 202 |
| 4 | 212 |
| 5 | 222 |
| 6 | 232 |
| 7 | 242 |
| 8 | 252 |
| 9 | 262 |
| 10 | 272 |
| 11 | 282 |
| 12 | 292 |
| 13 | 2002 |
| 14 | 2112 |
| 15 | 2222 |
| 16 | 2332 |
| 17 | 2442 |
| 18 | 2552 |
| 19 | 2662 |
| 20 | 2772 |
| 21 | 2882 |
| 22 | 2992 |
| 23 | 20002 |
| 24 | 20102 |
| 25 | 20202 |
| 26 | 20302 |
| 27 | 20402 |
| 28 | 20502 |
| 29 | 20602 |
| 30 | 20702 |
| 31 | 20802 |
| 32 | 20902 |
| 33 | 21012 |
| 34 | 21112 |
| 35 | 21212 |
| 36 | 21312 |
| 37 | 21412 |
| 38 | 21512 |
| 39 | 21612 |
| 40 | 21712 |
| 41 | 21812 |
| 42 | 21912 |