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 | 2 |
| 5 | -2 |
| 6 | 2 |
| 7 | -3 |
| 8 | 4 |
| 9 | -4 |
| 10 | 5 |
| 11 | -7 |
| 12 | 8 |
| 13 | -9 |
| 14 | 11 |
| 15 | -13 |
| 16 | 15 |
| 17 | -18 |
| 18 | 21 |
| 19 | -24 |
| 20 | 28 |
| 21 | -32 |
| 22 | 37 |
| 23 | -43 |
| 24 | 49 |
| 25 | -55 |
| 26 | 63 |
| 27 | -72 |
| 28 | 81 |
| 29 | -92 |
| 30 | 104 |
| 31 | -117 |
| 32 | 131 |
| 33 | -147 |
| 34 | 166 |
| 35 | -185 |
| 36 | 206 |
| 37 | -231 |
| 38 | 257 |
| 39 | -285 |
| 40 | 317 |
| 41 | -353 |
| 42 | 391 |
| 43 | -432 |
| 44 | 478 |
| 45 | -528 |
| 46 | 583 |
| 47 | -643 |
| 48 | 708 |
| 49 | -778 |
| 50 | 855 |
| 51 | -940 |
| 52 | 1031 |
| 53 | -1130 |
| 54 | 1238 |
| 55 | -1354 |