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 | 0 |
| 1 | 0 |
| 2 | 1 |
| 3 | -1 |
| 4 | 0 |
| 5 | 1 |
| 6 | -3 |
| 7 | 2 |
| 8 | 1 |
| 9 | -5 |
| 10 | 8 |
| 11 | -4 |
| 12 | -7 |
| 13 | 18 |
| 14 | -20 |
| 15 | 9 |
| 16 | 32 |
| 17 | -56 |
| 18 | 49 |
| 19 | -25 |
| 20 | -120 |
| 21 | 161 |
| 22 | -123 |
| 23 | 82 |
| 24 | 401 |
| 25 | -445 |
| 26 | 328 |
| 27 | -284 |
| 28 | -1247 |
| 29 | 1218 |
| 30 | -940 |
| 31 | 969 |
| 32 | 3712 |
| 33 | -3376 |
| 34 | 2849 |
| 35 | -3185 |
| 36 | -10800 |
| 37 | 9601 |
| 38 | -8883 |
| 39 | 10082 |
| 40 | 31201 |
| 41 | -28085 |
| 42 | 27848 |
| 43 | -30964 |
| 44 | -90487 |
| 45 | 84018 |
| 46 | -86660 |
| 47 | 93129 |
| 48 | 264992 |
| 49 | -254696 |