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 | 12 |
| 5 | 60 |
| 6 | 120 |
| 7 | 840 |
| 8 | 1680 |
| 9 | 5040 |
| 10 | 10080 |
| 11 | 110880 |
| 12 | 221760 |
| 13 | 2882880 |
| 14 | 5765760 |
| 15 | 17297280 |
| 16 | 34594560 |
| 17 | 588107520 |
| 18 | 1176215040 |
| 19 | 22348085760 |
| 20 | 44696171520 |
| 21 | 134088514560 |
| 22 | 268177029120 |
| 23 | 6168071669760 |
| 24 | 12336143339520 |
| 25 | 61680716697600 |