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 | -2 |
| 2 | 1 |
| 3 | 0 |
| 4 | -1 |
| 5 | 3 |
| 6 | -3 |
| 7 | 1 |
| 8 | 1 |
| 9 | -5 |
| 10 | 9 |
| 11 | -7 |
| 12 | 1 |
| 13 | 7 |
| 14 | -19 |
| 15 | 25 |
| 16 | -15 |
| 17 | -5 |
| 18 | 33 |
| 19 | -63 |
| 20 | 65 |
| 21 | -25 |
| 22 | -43 |
| 23 | 129 |
| 24 | -191 |
| 25 | 155 |
| 26 | -7 |
| 27 | -215 |
| 28 | 449 |
| 29 | -537 |
| 30 | 317 |
| 31 | 201 |
| 32 | -879 |
| 33 | 1435 |
| 34 | -1391 |
| 35 | 433 |
| 36 | 1281 |
| 37 | -3193 |
| 38 | 4261 |
| 39 | -3215 |
| 40 | -415 |
| 41 | 5755 |
| 42 | -10647 |
| 43 | 11737 |
| 44 | -6015 |
| 45 | -6585 |
| 46 | 22157 |
| 47 | -33031 |
| 48 | 29489 |
| 49 | -5445 |