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 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 0 |
| 9 | 0 |
| 10 | 79360 |
| 11 | 3891712 |
| 12 | 108736512 |
| 13 | 2283154432 |
| 14 | 40155709440 |
| 15 | 625974681600 |
| 16 | 8946380963840 |
| 17 | 119830778347520 |
| 18 | 1527173964103680 |
| 19 | 18720292422287360 |
| 20 | 222492157815029760 |
| 21 | 2579416038567051264 |
| 22 | 29306002590306140160 |
| 23 | 327494389862875791360 |