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 | 1 |
| 3 | -5 |
| 4 | 1 |
| 5 | 89 |
| 6 | 1 |
| 7 | -2603 |
| 8 | 1 |
| 9 | 133265 |
| 10 | 1 |
| 11 | -10449779 |
| 12 | 1 |
| 13 | 1161734969 |
| 14 | 1 |
| 15 | -173838018059 |
| 16 | 1 |
| 17 | 33692909616161 |
| 18 | 1 |
| 19 | -8210919096355811 |
| 20 | 1 |
| 21 | 2457354686029706057 |
| 22 | 1 |
| 23 | -886023132463389334523 |
| 24 | 1 |
| 25 | 378811390242562021309361 |
| 26 | 1 |
| 27 | -189490246977278296495043411 |
| 28 | 1 |
| 29 | 109640147405400620012620910681 |