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 | 0 |
| 2 | 2 |
| 3 | 4 |
| 4 | 8 |
| 5 | 12 |
| 6 | 20 |
| 7 | 24 |
| 8 | 36 |
| 9 | 48 |
| 10 | 60 |
| 11 | 72 |
| 12 | 120 |
| 13 | 144 |
| 14 | 180 |
| 15 | 288 |
| 16 | 300 |
| 17 | 360 |
| 18 | 420 |
| 19 | 540 |
| 20 | 660 |
| 21 | 720 |
| 22 | 840 |
| 23 | 1080 |