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 | 2 |
| 3 | 6 |
| 4 | 24 |
| 5 | 120 |
| 6 | 720 |
| 7 | 5040 |
| 8 | 55440 |
| 9 | 720720 |
| 10 | 12252240 |
| 11 | 232792560 |
| 12 | 6750984240 |
| 13 | 276790353840 |
| 14 | 12732356276640 |
| 15 | 523410559111440 |
| 16 | 24076885719126240 |
| 17 | 1131613628798933280 |
| 18 | 100713612963105061920 |
| 19 | 20042008979657907322080 |