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) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | -1 |
| 6 | 2 |
| 7 | -1 |
| 8 | -1 |
| 9 | -1 |
| 10 | 19 |
| 11 | -1 |
| 12 | -1 |
| 13 | -2323 |
| 14 | -89 |
| 15 | 304 |
| 16 | 304 |
| 17 | 163 |
| 18 | 163 |
| 19 | -81988 |
| 20 | -81988 |
| 21 | -15019 |
| 22 | 410857 |
| 23 | -249979 |
| 24 | -249979 |
| 25 | -249979 |
| 26 | 4165258 |
| 27 | 4165258 |
| 28 | 4165258 |
| 29 | 9246047 |
| 30 | -65721449 |
| 31 | -4193929329 |
| 32 | -4193929329 |
| 33 | -6504197377 |
| 34 | -302679716 |
| 35 | 2562470143 |