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) |
|---|---|
| 3 | 3 |
| 4 | 6 |
| 5 | 12 |
| 6 | 48 |
| 7 | 51 |
| 8 | 330 |
| 9 | 1100 |
| 10 | 702 |
| 11 | 8120 |
| 12 | 980 |
| 13 | 5499 |
| 14 | 110880 |
| 15 | 10472 |
| 16 | 2688 |
| 17 | 2127411 |
| 18 | 517104 |
| 19 | 710640 |
| 20 | 396480 |
| 21 | 2761803 |
| 22 | 4254120 |
| 23 | 13347975 |
| 24 | 707000 |
| 25 | 3655827 |