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 | 7 |
| 2 | 14 |
| 3 | 42 |
| 4 | 168 |
| 5 | 840 |
| 6 | 5040 |
| 7 | 35280 |
| 8 | 282240 |
| 9 | 2540160 |
| 10 | 25401600 |
| 11 | 279417600 |
| 12 | 3353011200 |
| 13 | 43589145600 |
| 14 | 610248038400 |
| 15 | 9153720576000 |
| 16 | 146459529216000 |
| 17 | 2489811996672000 |
| 18 | 44816615940096000 |
| 19 | 851515702861824000 |