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 | 3 |
| 3 | 24 |
| 4 | 402 |
| 5 | 11616 |
| 6 | 514608 |
| 7 | 32394624 |
| 8 | 2748340752 |
| 9 | 302234850816 |
| 10 | 41811782731008 |
| 11 | 7106160248346624 |
| 12 | 1455425220196234752 |
| 13 | 353536812021243273216 |
| 14 | 100492698847094242603008 |
| 15 | 33045185784774350171111424 |