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 | 6 |
| 2 | 60 |
| 3 | 648 |
| 4 | 7344 |
| 5 | 85536 |
| 6 | 1014336 |
| 7 | 12182400 |
| 8 | 147702528 |
| 9 | 1803907584 |
| 10 | 22159733760 |
| 11 | 273508669440 |
| 12 | 3389106769920 |
| 13 | 42134712606720 |
| 14 | 525323149885440 |
| 15 | 6565657319866368 |
| 16 | 82235651779657728 |
| 17 | 1031956779869798400 |