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 | 16 |
| 3 | 400 |
| 4 | 13600 |
| 5 | 584800 |
| 6 | 30409600 |
| 7 | 1854985600 |
| 8 | 129848992000 |
| 9 | 10258070368000 |
| 10 | 902710192384000 |
| 11 | 87562888661248000 |
| 12 | 9281666198092288000 |
| 13 | 1067391612780613120000 |
| 14 | 132356559984796026880000 |
| 15 | 17603422477977871575040000 |
| 16 | 2499685991872857763655680000 |
| 17 | 377452584772801522312007680000 |