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 | 0 |
| 3 | -5 |
| 4 | 3 |
| 5 | 9 |
| 6 | -7 |
| 7 | -15 |
| 8 | 9 |
| 9 | 27 |
| 10 | -12 |
| 11 | -45 |
| 12 | 22 |
| 13 | 66 |
| 14 | -36 |
| 15 | -99 |
| 16 | 51 |
| 17 | 153 |
| 18 | -73 |
| 19 | -222 |
| 20 | 108 |
| 21 | 311 |
| 22 | -159 |
| 23 | -441 |
| 24 | 221 |
| 25 | 624 |
| 26 | -297 |
| 27 | -863 |
| 28 | 414 |
| 29 | 1170 |
| 30 | -575 |
| 31 | -1584 |
| 32 | 765 |
| 33 | 2144 |
| 34 | -1014 |
| 35 | -2862 |
| 36 | 1361 |
| 37 | 3774 |
| 38 | -1809 |
| 39 | -4964 |
| 40 | 2361 |
| 41 | 6516 |
| 42 | -3063 |
| 43 | -8481 |