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 | 12 |
| 3 | 56 |
| 4 | 180 |
| 5 | 992 |
| 6 | 16256 |
| 7 | 127400 |
| 8 | 441000 |
| 9 | 2646000 |
| 10 | 67100672 |
| 11 | 325458000 |
| 12 | 2758909440 |
| 13 | 17179738112 |
| 14 | 274877382656 |