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 | -4 |
| 2 | 7 |
| 3 | 17 |
| 4 | -14 |
| 5 | -637 |
| 6 | -2951 |
| 7 | 14126 |
| 8 | 333205 |
| 9 | 2076245 |
| 10 | -12283700 |
| 11 | -423234511 |
| 12 | -4163106203 |
| 13 | 8148184700 |
| 14 | 952894223755 |
| 15 | 15568620884189 |
| 16 | 69314620864450 |
| 17 | -2816256959131561 |
| 18 | -83397946135434515 |
| 19 | -1025683419252783946 |
| 20 | 4726361848234575553 |
| 21 | 525779836596438636689 |
| 22 | 12363747028673287330948 |
| 23 | 112888493670408785796989 |