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) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 6 |
| 3 | 360 |
| 4 | 302400 |
| 5 | 4572288000 |
| 6 | 1520925880320000 |
| 7 | 13153940405570764800000 |
| 8 | 3412910854477066178396160000000 |
| 9 | 30107378079113824305786648526848000000000 |