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 | 0 |
| 2 | 1 |
| 3 | -1 |
| 4 | 2 |
| 5 | -1 |
| 6 | 2 |
| 7 | -2 |
| 8 | 4 |
| 9 | -3 |
| 10 | 5 |
| 11 | -5 |
| 12 | 8 |
| 13 | -7 |
| 14 | 10 |
| 15 | -10 |
| 16 | 15 |
| 17 | -14 |
| 18 | 19 |
| 19 | -20 |
| 20 | 27 |
| 21 | -26 |
| 22 | 34 |
| 23 | -36 |
| 24 | 47 |
| 25 | -47 |
| 26 | 59 |
| 27 | -63 |
| 28 | 79 |
| 29 | -81 |
| 30 | 99 |
| 31 | -106 |
| 32 | 130 |
| 33 | -135 |
| 34 | 162 |
| 35 | -174 |
| 36 | 208 |
| 37 | -219 |
| 38 | 258 |
| 39 | -278 |
| 40 | 328 |
| 41 | -347 |
| 42 | 404 |
| 43 | -436 |
| 44 | 507 |
| 45 | -540 |
| 46 | 621 |
| 47 | -671 |
| 48 | 772 |
| 49 | -825 |
| 50 | 941 |
| 51 | -1017 |
| 52 | 1159 |
| 53 | -1242 |
| 54 | 1405 |