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 | 2 |
| 2 | 12 |
| 3 | 144 |
| 4 | 2880 |
| 5 | 86400 |
| 6 | 3628800 |
| 7 | 203212800 |
| 8 | 14631321600 |
| 9 | 1316818944000 |
| 10 | 144850083840000 |
| 11 | 19120211066880000 |
| 12 | 2982752926433280000 |
| 13 | 542861032610856960000 |
| 14 | 114000816848279961600000 |
| 15 | 27360196043587190784000000 |
| 16 | 7441973323855715893248000000 |