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 | 4 |
| 1 | 24 |
| 2 | 216 |
| 3 | 2160 |
| 4 | 32400 |
| 5 | 810000 |
| 6 | 9525600 |
| 7 | 238140000 |
| 8 | 8334900000 |
| 9 | 408410100000 |
| 10 | 6051137400000 |
| 11 | 296505732600000 |
| 12 | 16307815293000000 |
| 13 | 1255701777561000000 |
| 14 | 151939915084881000000 |
| 15 | 1074848105961630000000 |
| 16 | 82763304159045510000000 |