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 | 8 |
| 2 | -48 |
| 3 | 400 |
| 4 | -3184 |
| 5 | 25488 |
| 6 | -203888 |
| 7 | 1631120 |
| 8 | -13048944 |
| 9 | 104391568 |
| 10 | -835132528 |
| 11 | 6681060240 |
| 12 | -53448481904 |
| 13 | 427587855248 |
| 14 | -3420702841968 |
| 15 | 27365622735760 |
| 16 | -218924981886064 |
| 17 | 1751399855088528 |
| 18 | -14011198840708208 |