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 | 1 |
| 2 | 3 |
| 3 | 60 |
| 4 | 1260 |
| 5 | 6720 |
| 6 | 90720 |
| 7 | 9979200 |
| 8 | 1037836800 |
| 9 | 10897286400 |
| 10 | 163459296000 |
| 11 | 59281238016000 |
| 12 | 15205637551104000 |
| 13 | 202741834014720000 |
| 14 | 5109094217170944000 |
| 15 | 3231502092360622080000 |
| 16 | 31022420086661971968000 |