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 | 2 |
| 2 | 8 |
| 3 | 48 |
| 4 | 384 |
| 5 | 3840 |
| 6 | 46080 |
| 7 | 645120 |
| 8 | 10321920 |
| 9 | 2786918400 |
| 10 | 2229534720 |
| 11 | 735746457600 |
| 12 | 5885971660800 |
| 13 | 765176315904000 |
| 14 | 192824431607808000 |
| 15 | 385648863215616000 |
| 16 | 12340763622899712000 |
| 17 | 18881368343036559360000 |
| 18 | 15105094674429247488000 |