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 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 1 |
| 6 | -1 |
| 7 | -1 |
| 8 | 2 |
| 9 | 2 |
| 10 | -2 |
| 11 | -2 |
| 12 | 4 |
| 13 | 4 |
| 14 | -6 |
| 15 | -6 |
| 16 | 9 |
| 17 | 9 |
| 18 | -13 |
| 19 | -13 |
| 20 | 21 |
| 21 | 21 |
| 22 | -31 |
| 23 | -31 |
| 24 | 47 |
| 25 | 47 |
| 26 | -71 |
| 27 | -71 |
| 28 | 109 |
| 29 | 109 |
| 30 | -165 |
| 31 | -165 |
| 32 | 250 |
| 33 | 250 |
| 34 | -380 |
| 35 | -380 |
| 36 | 578 |
| 37 | 578 |
| 38 | -876 |
| 39 | -876 |
| 40 | 1330 |
| 41 | 1330 |
| 42 | -2020 |
| 43 | -2020 |
| 44 | 3068 |
| 45 | 3068 |
| 46 | -4656 |
| 47 | -4656 |
| 48 | 7070 |
| 49 | 7070 |
| 50 | -10736 |
| 51 | -10736 |
| 52 | 16300 |
| 53 | 16300 |
| 54 | -24746 |
| 55 | -24746 |
| 56 | 37574 |
| 57 | 37574 |
| 58 | -57050 |
| 59 | -57050 |