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 | -1 |
| 2 | 0 |
| 3 | -1 |
| 4 | 1 |
| 5 | -1 |
| 6 | 2 |
| 7 | -2 |
| 8 | 2 |
| 9 | -3 |
| 10 | 4 |
| 11 | -4 |
| 12 | 5 |
| 13 | -6 |
| 14 | 6 |
| 15 | -9 |
| 16 | 11 |
| 17 | -10 |
| 18 | 14 |
| 19 | -16 |
| 20 | 17 |
| 21 | -22 |
| 22 | 24 |
| 23 | -26 |
| 24 | 32 |
| 25 | -37 |
| 26 | 40 |
| 27 | -47 |
| 28 | 54 |
| 29 | -58 |
| 30 | 70 |
| 31 | -80 |
| 32 | 84 |
| 33 | -100 |
| 34 | 112 |
| 35 | -122 |
| 36 | 143 |
| 37 | -158 |
| 38 | 172 |
| 39 | -198 |
| 40 | 222 |
| 41 | -242 |
| 42 | 274 |
| 43 | -306 |
| 44 | 332 |
| 45 | -379 |
| 46 | 422 |
| 47 | -454 |
| 48 | 515 |
| 49 | -569 |
| 50 | 620 |
| 51 | -698 |
| 52 | 766 |
| 53 | -834 |
| 54 | 932 |
| 55 | -1028 |