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 | -1 |
| 3 | 2 |
| 4 | 1 |
| 5 | -4 |
| 6 | 0 |
| 7 | 7 |
| 8 | -3 |
| 9 | -11 |
| 10 | 10 |
| 11 | 15 |
| 12 | -24 |
| 13 | -16 |
| 14 | 49 |
| 15 | 7 |
| 16 | -89 |
| 17 | 26 |
| 18 | 145 |
| 19 | -108 |
| 20 | -208 |
| 21 | 279 |
| 22 | 245 |
| 23 | -595 |
| 24 | -174 |
| 25 | 1119 |
| 26 | -176 |
| 27 | -1888 |
| 28 | 1121 |
| 29 | 2831 |
| 30 | -3185 |
| 31 | -3598 |
| 32 | 7137 |
| 33 | 3244 |
| 34 | -13920 |
| 35 | 295 |
| 36 | 24301 |
| 37 | -10971 |
| 38 | -37926 |
| 39 | 35567 |
| 40 | 51256 |
| 41 | -84464 |
| 42 | -53615 |
| 43 | 171287 |
| 44 | 20407 |
| 45 | -309366 |
| 46 | 97265 |
| 47 | 501060 |
| 48 | -386224 |
| 49 | -713161 |