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 | 2 |
| 3 | 126 |
| 4 | 1638 |
| 5 | 2394 |
| 6 | 8190 |
| 7 | 139230 |
| 8 | 155610 |
| 9 | 2645370 |
| 10 | 5757570 |
| 11 | 97878690 |
| 12 | 420302610 |
| 13 | 1963331370 |
| 14 | 7145144370 |