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 | 34 |
| 2 | -302 |
| 3 | -109412 |
| 4 | -2399060 |
| 5 | 556522744 |
| 6 | 36410920696 |
| 7 | -3630489660848 |
| 8 | -495046505092208 |
| 9 | 25514450230996000 |
| 10 | 7363491547673817376 |
| 11 | -121641971747011889216 |
| 12 | -122231504480991087309632 |
| 13 | -2027623214667976954804352 |
| 14 | 2247836746633993852403416960 |