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) |
|---|---|
| 1 | 1 |
| 2 | -1 |
| 3 | -1 |
| 4 | 0 |
| 5 | 0 |
| 6 | 2 |
| 7 | 1 |
| 8 | 0 |
| 9 | -2 |
| 10 | -5 |
| 11 | 2 |
| 12 | 3 |
| 13 | 5 |
| 14 | 6 |
| 15 | -10 |
| 16 | -12 |
| 17 | -9 |
| 18 | 11 |
| 19 | 32 |
| 20 | 11 |
| 21 | -5 |
| 22 | -55 |
| 23 | -61 |
| 24 | 29 |
| 25 | 84 |
| 26 | 129 |
| 27 | 9 |
| 28 | -188 |
| 29 | -232 |
| 30 | -136 |
| 31 | 322 |
| 32 | 567 |
| 33 | 255 |
| 34 | -354 |
| 35 | -1185 |
| 36 | -840 |
| 37 | 585 |
| 38 | 2038 |
| 39 | 2318 |
| 40 | -594 |
| 41 | -3909 |
| 42 | -4761 |
| 43 | -929 |
| 44 | 7387 |
| 45 | 10441 |
| 46 | 3930 |
| 47 | -11137 |
| 48 | -23097 |
| 49 | -12215 |
| 50 | 16547 |
| 51 | 44716 |
| 52 | 36786 |
| 53 | -23108 |