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 | 4 |
| 2 | 36 |
| 3 | 252 |
| 4 | 4788 |
| 5 | 9576 |
| 6 | 277704 |
| 7 | 4720968 |
| 8 | 61372584 |
| 9 | 675098424 |
| 10 | 4725688968 |
| 11 | 14177066904 |
| 12 | 836446947336 |
| 13 | 6691575578688 |
| 14 | 153906238309824 |
| 15 | 5694530817463488 |
| 16 | 449867934579615552 |
| 17 | 449867934579615552 |