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 | 0 |
| 1 | 1 |
| 2 | 2 |
| 3 | 24 |
| 4 | 480 |
| 5 | 13440 |
| 6 | 483840 |
| 7 | 21288960 |
| 8 | 1107025920 |
| 9 | 66421555200 |
| 10 | 4516665753600 |
| 11 | 343266597273600 |
| 12 | 28834394170982400 |
| 13 | 2652764263730380800 |
| 14 | 265276426373038080000 |
| 15 | 28649854048288112640000 |