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 | 5 |
| 2 | 9 |
| 3 | 17 |
| 4 | 21 |
| 5 | 29 |
| 6 | 53 |
| 7 | 57 |
| 8 | 105 |
| 9 | 111 |
| 10 | 279 |
| 11 | 303 |
| 12 | 435 |
| 13 | 483 |
| 14 | 677 |
| 15 | 1049 |
| 16 | 1217 |
| 17 | 1395 |
| 18 | 9651 |
| 19 | 26031 |
| 20 | 31937 |