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 | 1 |
| 3 | 0 |
| 4 | -1 |
| 5 | 0 |
| 6 | 1 |
| 7 | -1 |
| 8 | 0 |
| 9 | -1 |
| 10 | 1 |
| 11 | 1 |
| 12 | 0 |
| 13 | 1 |
| 14 | -1 |
| 15 | -2 |
| 16 | 5 |
| 17 | 0 |
| 18 | 3 |
| 19 | 1 |
| 20 | 2 |
| 21 | -9 |
| 22 | 5 |
| 23 | 0 |
| 24 | 2 |
| 25 | 4 |
| 26 | -2 |
| 27 | 9 |
| 28 | -9 |
| 29 | -21 |
| 30 | 0 |
| 31 | -15 |
| 32 | 5 |
| 33 | -10 |
| 34 | -9 |
| 35 | 9 |
| 36 | 50 |
| 37 | -105 |
| 38 | 0 |
| 39 | -62 |
| 40 | -19 |
| 41 | -18 |
| 42 | -54 |
| 43 | -9 |
| 44 | -50 |
| 45 | 267 |
| 46 | -141 |
| 47 | 0 |
| 48 | -56 |
| 49 | -119 |
| 50 | 42 |
| 51 | -126 |
| 52 | -63 |
| 53 | 50 |
| 54 | -267 |