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 | 2 |
| 1 | 6 |
| 2 | 8 |
| 3 | 180 |
| 4 | 288 |
| 5 | 10080 |
| 6 | 17280 |
| 7 | 453600 |
| 8 | 806400 |
| 9 | 47900160 |
| 10 | 87091200 |
| 11 | 217945728000 |
| 12 | 402361344000 |
| 13 | 2241727488000 |
| 14 | 4184557977600 |
| 15 | 2000741783040000 |
| 16 | 3766102179840000 |
| 17 | 2838385676206080000 |
| 18 | 5377993912811520000 |
| 19 | 1686001091666411520000 |
| 20 | 3211430650793164800000 |
| 21 | 423033001181754163200000 |