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 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 60 |
| 5 | 960 |
| 6 | 24000 |
| 7 | 861840 |
| 8 | 42104160 |
| 9 | 2686763520 |
| 10 | 217039253760 |
| 11 | 21651071904000 |
| 12 | 2614084251609600 |
| 13 | 375698806311628800 |
| 14 | 63383303286471168000 |
| 15 | 12403896267489382656000 |
| 16 | 2786994829444848422400000 |
| 17 | 712575504763406361133056000 |