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) |
|---|---|
| 1 | 0 |
| 2 | 1152 |
| 3 | 18048 |
| 4 | 308544 |
| 5 | 4744704 |
| 6 | 70371048 |
| 7 | 1012764384 |
| 8 | 14272781904 |
| 9 | 197924795136 |
| 10 | 2710127012280 |
| 11 | 36731155605600 |
| 12 | 493646491209600 |
| 13 | 6587572246924800 |
| 14 | 87381895621488648 |
| 15 | 1153101183028855008 |