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 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 24 |
| 5 | 120 |
| 6 | 720 |
| 7 | 10080 |
| 8 | 241920 |
| 9 | 8709120 |
| 10 | 435456000 |
| 11 | 28740096000 |
| 12 | 4828336128000 |
| 13 | 1506440871936000 |
| 14 | 759246199455744000 |
| 15 | 569434649591808000000 |
| 16 | 601322989968949248000000 |