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 | 3 |
| 2 | 15 |
| 3 | 17 |
| 4 | 45 |
| 5 | 73 |
| 6 | 83 |
| 7 | 165 |
| 8 | 177 |
| 9 | 181 |
| 10 | 229 |
| 11 | 377 |
| 12 | 383 |
| 13 | 787 |
| 14 | 2585 |
| 15 | 3127 |
| 16 | 3635 |
| 17 | 4777 |
| 18 | 36417 |
| 19 | 63337 |
| 20 | 166705 |
| 21 | 418411 |