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 | 2 |
| 2 | 24 |
| 3 | 540 |
| 4 | 17920 |
| 5 | 787500 |
| 6 | 43110144 |
| 7 | 2826399576 |
| 8 | 215922769920 |
| 9 | 18836384175180 |
| 10 | 1847560000000000 |
| 11 | 201267982422458952 |
| 12 | 24110526523754151936 |
| 13 | 3150082833623386551800 |
| 14 | 445775933018180704665600 |
| 15 | 67925014299030761718750000 |
| 16 | 11087976122055526032070410240 |