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 | 3 |
| 2 | 28 |
| 3 | 108 |
| 4 | 2352 |
| 5 | 2544 |
| 6 | 7936 |
| 7 | 13632 |
| 8 | 26736 |
| 9 | 209904 |
| 10 | 256608 |
| 11 | 1394112 |
| 12 | 2052864 |
| 13 | 2169456 |
| 14 | 2490864 |
| 15 | 11942400 |
| 16 | 18884416 |
| 17 | 258072480 |
| 18 | 415272960 |
| 19 | 2064579840 |
| 20 | 3737456640 |
| 21 | 3963371520 |
| 22 | 4672512000 |