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 | 612 |
| 2 | 48996 |
| 3 | 1207680 |
| 4 | 12573540 |
| 5 | 73617480 |
| 6 | 318102912 |
| 7 | 1090632960 |
| 8 | 3176573796 |
| 9 | 8148505828 |
| 10 | 18918517320 |
| 11 | 40578145920 |
| 12 | 81375600000 |
| 13 | 154398101832 |
| 14 | 279331331328 |
| 15 | 484986858240 |
| 16 | 812932819812 |
| 17 | 1320330798792 |
| 18 | 2085523894756 |
| 19 | 3214498469760 |
| 20 | 4845373383240 |
| 21 | 7157876711424 |
| 22 | 10386510802560 |