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 | 1 |
| 3 | 9 |
| 4 | 3 |
| 5 | 3 |
| 6 | 25 |
| 7 | 7 |
| 8 | 21 |
| 9 | 435 |
| 10 | 241 |
| 11 | 3 |
| 12 | 153 |
| 13 | 151 |
| 14 | 493 |
| 15 | 537 |
| 16 | 2871 |
| 17 | 1713 |
| 18 | 4941 |
| 19 | 4963 |
| 20 | 307 |
| 21 | 28413 |
| 22 | 5035 |
| 23 | 1615 |
| 24 | 43525 |
| 25 | 9973 |