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 | 22 |
| 3 | 756 |
| 4 | 35464 |
| 5 | 2112320 |
| 6 | 152681760 |
| 7 | 12984899200 |
| 8 | 1270453824640 |
| 9 | 140587147048320 |
| 10 | 204867922610391040 |
| 11 | 222308451584243548160 |
| 12 | 277934723066170025856000 |
| 13 | 385262452280397590195584000 |
| 14 | 954777912911324324000159027200 |
| 15 | 3057686768847576381964905048883200 |