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 | -2 |
| 2 | -6 |
| 3 | 22 |
| 4 | 426 |
| 5 | 598 |
| 6 | -54006 |
| 7 | -568778 |
| 8 | 8381226 |
| 9 | 277762198 |
| 10 | -123822006 |
| 11 | -141432141578 |
| 12 | -1958226061974 |
| 13 | 70457642899798 |
| 14 | 2812274227385994 |
| 15 | -17169209695778378 |
| 16 | -3417280244608089174 |
| 17 | -48220222006064346602 |