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 | 11 |
| 3 | 20 |
| 4 | 110 |
| 5 | 200 |
| 6 | 1100 |
| 7 | 2000 |
| 8 | 11000 |
| 9 | 20000 |
| 10 | 110000 |
| 11 | 200000 |
| 12 | 1100000 |
| 13 | 2000000 |
| 14 | 11000000 |
| 15 | 20000000 |
| 16 | 110000000 |
| 17 | 200000000 |
| 18 | 1100000000 |
| 19 | 2000000000 |
| 20 | 11000000000 |
| 21 | 20000000000 |
| 22 | 110000000000 |
| 23 | 200000000000 |
| 24 | 1100000000000 |