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 | 3 |
| 3 | -3 |
| 4 | 2 |
| 5 | 1 |
| 6 | -5 |
| 7 | 10 |
| 8 | -13 |
| 9 | 13 |
| 10 | -6 |
| 11 | -7 |
| 12 | 27 |
| 13 | -46 |
| 14 | 59 |
| 15 | -51 |
| 16 | 18 |
| 17 | 49 |
| 18 | -133 |
| 19 | 218 |
| 20 | -253 |
| 21 | 205 |
| 22 | -22 |
| 23 | -279 |
| 24 | 667 |
| 25 | -990 |
| 26 | 1099 |
| 27 | -755 |
| 28 | -126 |
| 29 | 1569 |
| 30 | -3205 |
| 31 | 4522 |
| 32 | -4589 |
| 33 | 2701 |
| 34 | 1754 |
| 35 | -8231 |
| 36 | 15387 |
| 37 | -20110 |
| 38 | 19035 |
| 39 | -8371 |
| 40 | -12814 |
| 41 | 42513 |
| 42 | -72069 |
| 43 | 88954 |
| 44 | -75997 |
| 45 | 20813 |
| 46 | 81098 |
| 47 | -212279 |
| 48 | 335003 |
| 49 | -385086 |
| 50 | 295531 |