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 | 11 |
| 3 | 220 |
| 4 | 6380 |
| 5 | 242440 |
| 6 | 11394680 |
| 7 | 638102080 |
| 8 | 41476635200 |
| 9 | 3069271004800 |
| 10 | 254749493398400 |
| 11 | 23436953392652800 |
| 12 | 2367132292657932800 |
| 13 | 260384552192372608000 |
| 14 | 30985761710892340352000 |
| 15 | 3966177498994219565056000 |
| 16 | 543366317362208080412672000 |
| 17 | 79331482334882379740250112000 |