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) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 144 |
| 3 | 10000 |
| 4 | 960400 |
| 5 | 112021056 |
| 6 | 14876193024 |
| 7 | 2167749739584 |
| 8 | 338710896810000 |
| 9 | 55880440123393600 |
| 10 | 9629613008027474176 |
| 11 | 1719721549507980904704 |
| 12 | 316402760115623198128384 |
| 13 | 59700436261400947600000000 |