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 | 1 |
| 3 | 36 |
| 4 | 864 |
| 5 | 17280 |
| 6 | 311040 |
| 7 | 5225472 |
| 8 | 83607552 |
| 9 | 1289945088 |
| 10 | 19349176320 |
| 11 | 283787919360 |
| 12 | 4086546038784 |
| 13 | 57954652913664 |
| 14 | 811365140791296 |
| 15 | 11234286564802560 |
| 16 | 154070215745863680 |
| 17 | 2095354934143746048 |