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 | 123832800 |
| 2 | 247695840 |
| 3 | 268337160 |
| 4 | 495421920 |
| 5 | 536707080 |
| 6 | 990874080 |
| 7 | 1073446920 |
| 8 | 1981778400 |
| 9 | 2146926600 |
| 10 | 3963587040 |
| 11 | 4293885960 |
| 12 | 7927204320 |
| 13 | 8587804680 |
| 14 | 15854438880 |
| 15 | 17175642120 |
| 16 | 31708908000 |
| 17 | 34351317000 |
| 18 | 63417846240 |
| 19 | 68702666760 |
| 20 | 124884879840 |
| 21 | 126713795040 |
| 22 | 126835722720 |