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 | 2 |
| 2 | 3 |
| 3 | 5 |
| 4 | 7 |
| 5 | 25 |
| 6 | 27 |
| 7 | 32 |
| 8 | 35 |
| 9 | 72 |
| 10 | 75 |
| 11 | 225 |
| 12 | 252 |
| 13 | 375 |
| 14 | 525 |
| 15 | 735 |
| 16 | 2352 |
| 17 | 3375 |
| 18 | 25725 |
| 19 | 273375 |
| 20 | 2333772 |
| 21 | 52732233225 |