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 | 11 |
| 2 | 20 |
| 3 | 21 |
| 4 | 31 |
| 5 | 41 |
| 6 | 51 |
| 7 | 61 |
| 8 | 71 |
| 9 | 81 |
| 10 | 91 |
| 11 | 101 |
| 12 | 201 |
| 13 | 202 |
| 14 | 301 |
| 15 | 401 |
| 16 | 501 |
| 17 | 601 |
| 18 | 701 |
| 19 | 801 |
| 20 | 901 |