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 | 625 |
| 6 | 9072 |
| 7 | 153664 |
| 8 | 2985984 |
| 9 | 65610000 |
| 10 | 1610510000 |
| 11 | 43717791744 |
| 12 | 1301153248512 |
| 13 | 42150011228416 |
| 14 | 1476840093750000 |
| 15 | 55662776156160000 |
| 16 | 2246042996417036288 |
| 17 | 96619713808095645696 |
| 18 | 4414553991933897025584 |