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 | 12 |
| 2 | 192 |
| 3 | 3360 |
| 4 | 61440 |
| 5 | 1153152 |
| 6 | 22020096 |
| 7 | 425677824 |
| 8 | 8304721920 |
| 9 | 163176499200 |
| 10 | 3224446697472 |
| 11 | 64012657213440 |
| 12 | 1275708366127104 |
| 13 | 25506581874278400 |
| 14 | 511404848311173120 |
| 15 | 10278423735852072960 |
| 16 | 207016682596362878976 |
| 17 | 4177272328882468945920 |
| 18 | 84430333294202899660800 |