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 | 280 |
| 2 | 34960 |
| 3 | 4960000 |
| 4 | 15887872 |
| 5 | 20527600 |
| 6 | 105056320 |
| 7 | 44781248512 |