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 | 10 |
| 2 | 80 |
| 3 | 2160 |
| 4 | 82720 |
| 5 | 3737120 |
| 6 | 186303840 |
| 7 | 9945915840 |
| 8 | 558476528000 |
| 9 | 32597366872320 |
| 10 | 1961752814181280 |
| 11 | 121020530395783040 |
| 12 | 7620016712806580160 |