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 | 22 |
| 2 | 146 |
| 3 | -11660 |
| 4 | -404564 |
| 5 | 6863912 |
| 6 | 834719224 |
| 7 | 4443809392 |
| 8 | -1877181877360 |
| 9 | -53314061897888 |
| 10 | 4537477909175584 |
| 11 | 280026043216724288 |
| 12 | -10709769915546886976 |
| 13 | -1371400569429065225600 |
| 14 | 16887916481473586409344 |
| 15 | 6861001657130755548544768 |
| 16 | 65320299895805538972610816 |