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 | 4 |
| 3 | 24 |
| 4 | 48 |
| 5 | 10080 |
| 6 | 20160 |
| 7 | 17297280 |
| 8 | 8995104518400 |
| 9 | 48519593772249600 |
| 10 | 1487541362038078419072000 |
| 11 | 4064469835236338497584529058950244109665514312688896000 |