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) |
|---|---|
| 8 | 1 |
| 9 | 8 |
| 10 | 36 |
| 11 | 120 |
| 12 | 330 |
| 13 | 792 |
| 14 | 1716 |
| 15 | 3432 |
| 16 | 6434 |
| 17 | 11440 |
| 18 | 19440 |
| 19 | 31824 |
| 20 | 50352 |
| 21 | 77520 |
| 22 | 116160 |
| 23 | 170544 |
| 24 | 244826 |
| 25 | 346104 |
| 26 | 479908 |
| 27 | 657792 |
| 28 | 886314 |
| 29 | 1184040 |
| 30 | 1557312 |
| 31 | 2035800 |
| 32 | 2623140 |
| 33 | 3365736 |
| 34 | 4260608 |
| 35 | 5379616 |
| 36 | 6704742 |
| 37 | 8347680 |
| 38 | 10263648 |
| 39 | 12619464 |