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 | -2 |
| 4 | 1 |
| 5 | -2 |
| 6 | 2 |
| 7 | -2 |
| 8 | 5 |
| 9 | -3 |
| 10 | 8 |
| 11 | -3 |
| 12 | 13 |
| 13 | -6 |
| 14 | 16 |
| 15 | -15 |
| 16 | 21 |
| 17 | -28 |
| 18 | 21 |
| 19 | -52 |
| 20 | 22 |
| 21 | -90 |
| 22 | 23 |
| 23 | -136 |
| 24 | 40 |
| 25 | -190 |
| 26 | 79 |
| 27 | -237 |
| 28 | 185 |
| 29 | -254 |
| 30 | 385 |
| 31 | -219 |
| 32 | 740 |
| 33 | -116 |
| 34 | 1279 |
| 35 | 49 |
| 36 | 2039 |
| 37 | 198 |
| 38 | 2923 |
| 39 | 130 |
| 40 | 3785 |
| 41 | -541 |
| 42 | 4215 |
| 43 | -2464 |
| 44 | 3638 |
| 45 | -6581 |
| 46 | 1204 |
| 47 | -14062 |
| 48 | -3889 |
| 49 | -26110 |
| 50 | -12267 |
| 51 | -43399 |
| 52 | -23264 |
| 53 | -65206 |
| 54 | -34085 |
| 55 | -87955 |
| 56 | -37666 |