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 |