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 | -3 |
| 2 | -5 |
| 3 | 7 |
| 4 | 26 |
| 5 | 0 |
| 6 | -97 |
| 7 | -97 |
| 8 | 265 |
| 9 | 627 |
| 10 | -362 |
| 11 | -2702 |
| 12 | -1351 |
| 13 | 8733 |
| 14 | 13775 |
| 15 | -18817 |
| 16 | -70226 |
| 17 | 0 |
| 18 | 262087 |
| 19 | 262087 |
| 20 | -716035 |
| 21 | -1694157 |
| 22 | 978122 |
| 23 | 7300802 |
| 24 | 3650401 |
| 25 | -23596563 |
| 26 | -37220045 |
| 27 | 50843527 |
| 28 | 189750626 |
| 29 | 0 |
| 30 | -708158977 |
| 31 | -708158977 |
| 32 | 1934726305 |
| 33 | 4577611587 |
| 34 | -2642885282 |
| 35 | -19726764302 |
| 36 | -9863382151 |