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 | 6 |
| 2 | 140 |
| 3 | 312 |
| 4 | 1560 |
| 5 | 14384 |
| 6 | 18018 |
| 7 | 40992 |
| 8 | 2337400 |
| 9 | 7012200 |
| 10 | 11027016 |
| 11 | 231402600 |
| 12 | 534775296 |
| 13 | 9866296440 |
| 14 | 11453072202 |