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 | 32 |
| 5 | 10080 |
| 6 | 3456 |
| 7 | 453600 |
| 8 | 115200 |
| 9 | 47900160 |
| 10 | 71680 |
| 11 | 217945728000 |
| 12 | 36578304000 |
| 13 | 2241727488000 |
| 14 | 45984153600 |
| 15 | 2000741783040000 |
| 16 | 918421504 |
| 17 | 43667471941632000 |
| 18 | 5751865147392000 |
| 19 | 240857298809487360000 |