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 | 576 |
| 3 | 63504 |
| 4 | 2166784 |
| 5 | 23328900 |
| 6 | 36578304 |
| 7 | 280361536 |
| 8 | 7136870400 |
| 9 | 12914731449 |
| 10 | 13437446400 |
| 11 | 285809990544 |
| 12 | 137599451136 |
| 13 | 333781196644 |
| 14 | 161488244736 |
| 15 | 1481478465600 |
| 16 | 974437482496 |
| 17 | 47691924412356 |
| 18 | 7438885314624 |