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 | 1456 |
| 3 | 15480 |
| 4 | 114660 |
| 5 | 2244600 |
| 6 | 3894768 |
| 7 | 25108200 |
| 8 | 27052704 |
| 9 | 65021040 |
| 10 | 112402080 |
| 11 | 1973921400 |