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 | 4 |
| 3 | -3 |
| 4 | -1 |
| 5 | 8 |
| 6 | -15 |
| 7 | 18 |
| 8 | -13 |
| 9 | -3 |
| 10 | 30 |
| 11 | -63 |
| 12 | 89 |
| 13 | -86 |
| 14 | 29 |
| 15 | 97 |
| 16 | -278 |
| 17 | 453 |
| 18 | -511 |
| 19 | 314 |
| 20 | 245 |
| 21 | -1151 |
| 22 | 2170 |
| 23 | -2795 |
| 24 | 2305 |
| 25 | -6 |
| 26 | -4331 |
| 27 | 9921 |
| 28 | -14534 |
| 29 | 14549 |
| 30 | -5887 |
| 31 | -13958 |
| 32 | 43029 |
| 33 | -72127 |
| 34 | 83898 |
| 35 | -55979 |
| 36 | -30079 |
| 37 | 174330 |
| 38 | -342124 |
| 39 | 454087 |
| 40 | -393943 |
| 41 | 45299 |
| 42 | 638945 |