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 | 8 |
| 2 | 160 |
| 3 | 1920 |
| 4 | 17408 |
| 5 | 133120 |
| 6 | 909312 |
| 7 | 5734400 |
| 8 | 34078720 |
| 9 | 193462272 |
| 10 | 1059061760 |
| 11 | 5628755968 |
| 12 | 29192355840 |
| 13 | 148310589440 |
| 14 | 740344987648 |
| 15 | 3639984783360 |
| 16 | 17660905521152 |
| 17 | 84696755077120 |
| 18 | 402008938905600 |
| 19 | 1890610243960832 |