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 | 1 |
| 2 | 3 |
| 3 | 9 |
| 4 | 13 |
| 5 | 15 |
| 6 | 18 |
| 7 | 19 |
| 8 | 33 |
| 9 | 49 |
| 10 | 67 |
| 11 | 73 |
| 12 | 90 |
| 13 | 109 |
| 14 | 163 |
| 15 | 391 |
| 16 | 522 |
| 17 | 607 |
| 18 | 729 |
| 19 | 810 |
| 20 | 1093 |
| 21 | 1639 |