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 | 12 |
| 4 | 24 |
| 5 | 72 |
| 6 | 360 |
| 7 | 720 |
| 8 | 2160 |
| 9 | 10800 |
| 10 | 75600 |
| 11 | 151200 |
| 12 | 453600 |
| 13 | 2268000 |
| 14 | 15876000 |
| 15 | 174636000 |
| 16 | 349272000 |
| 17 | 1047816000 |
| 18 | 5239080000 |
| 19 | 36673560000 |
| 20 | 403409160000 |
| 21 | 5244319080000 |
| 22 | 10488638160000 |
| 23 | 31465914480000 |
| 24 | 157329572400000 |
| 25 | 1101307006800000 |
| 26 | 12114377074800000 |