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 | 23 |
| 3 | 9 |
| 4 | -757 |
| 5 | -381 |
| 6 | 399641 |
| 7 | 38829 |
| 8 | -8068717 |
| 9 | -7010361 |
| 10 | 20212713133 |
| 11 | 1948556049 |
| 12 | -55894488760807 |
| 13 | -769514725941 |
| 14 | 283145183503343 |
| 15 | 409271750511669 |
| 16 | -2926186778206842029 |
| 17 | -281971236851531121 |
| 18 | 17744532347627812001939 |
| 19 | 244268324199676177689 |