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 | 1 |
| 2 | 3 |
| 3 | 6 |
| 4 | 36 |
| 5 | 288 |
| 6 | 2240 |
| 7 | 20736 |
| 8 | 264384 |
| 9 | 2892672 |
| 10 | 63452160 |
| 11 | 1528823808 |
| 12 | 36691771392 |
| 13 | 941182156800 |
| 14 | 29143203840000 |
| 15 | 803229696000000 |
| 16 | 36978425856000000 |