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) |
|---|---|
| 0 | 2 |
| 1 | 30 |
| 2 | 1260 |
| 3 | 60060 |
| 4 | 2042040 |
| 5 | 446185740 |
| 6 | 25878772920 |
| 7 | 7420738134810 |
| 8 | 304250263527210 |
| 9 | 52331045326680120 |
| 10 | 9223346738827371150 |
| 11 | 1922760350154212639070 |
| 12 | 469153525437627883933080 |