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 | 32 |
| 2 | 576 |
| 3 | 7680 |
| 4 | 84480 |
| 5 | 811008 |
| 6 | 7028736 |
| 7 | 56229888 |
| 8 | 421724160 |
| 9 | 2998927360 |
| 10 | 20392706048 |
| 11 | 133479530496 |
| 12 | 845370359808 |
| 13 | 5202279137280 |
| 14 | 31213674823680 |
| 15 | 183120225632256 |
| 16 | 1052941297385472 |
| 17 | 5946021444059136 |
| 18 | 33033452466995200 |
| 19 | 180814687187763200 |
| 20 | 976399310813921280 |