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 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 1 |
| 7 | 420 |
| 8 | 100814 |
| 9 | 18151560 |
| 10 | 2723868147 |
| 11 | 359750257020 |
| 12 | 43199991728608 |
| 13 | 4817721638970240 |
| 14 | 506352103838393813 |
| 15 | 50691406225311551700 |
| 16 | 4872449650707855334482 |
| 17 | 452435489306282260691640 |