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 | 1 |
| 2 | 3 |
| 3 | 4 |
| 4 | 15 |
| 5 | 24 |
| 6 | 124 |
| 7 | 192 |
| 8 | 1020 |
| 9 | 1920 |
| 10 | 12264 |
| 11 | 23040 |
| 12 | 159666 |
| 13 | 322560 |
| 14 | 2555280 |
| 15 | 5041344 |
| 16 | 40893840 |
| 17 | 90744192 |
| 18 | 761260368 |
| 19 | 1814883840 |
| 20 | 15732804296 |
| 21 | 38900010240 |
| 22 | 377587663200 |
| 23 | 933600245760 |
| 24 | 9087075973248 |
| 25 | 23520702965760 |
| 26 | 254438142416640 |