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 | 6 |
| 2 | 120 |
| 3 | 210 |
| 4 | 990 |
| 5 | 7140 |
| 6 | 185136 |
| 7 | 242556 |
| 8 | 2162160 |
| 9 | 8239770 |
| 10 | 258474216 |
| 11 | 279909630 |
| 12 | 9508687656 |
| 13 | 323015470680 |
| 14 | 10973017315470 |
| 15 | 372759573255306 |
| 16 | 12662852473364940 |
| 17 | 430164224521152660 |
| 18 | 14612920781245825506 |
| 19 | 496409142337836914550 |