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 | 8 |
| 2 | 72 |
| 3 | 480 |
| 4 | 2640 |
| 5 | 12672 |
| 6 | 54912 |
| 7 | 219648 |
| 8 | 823680 |
| 9 | 2928640 |
| 10 | 9957376 |
| 11 | 32587776 |
| 12 | 103194624 |
| 13 | 317521920 |
| 14 | 952565760 |
| 15 | 2794192896 |
| 16 | 8033304576 |
| 17 | 22682271744 |
| 18 | 63006310400 |
| 19 | 172438323200 |
| 20 | 465583472640 |
| 21 | 1241555927040 |
| 22 | 3273192898560 |