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 | 0 |
| 3 | 0 |
| 4 | 2 |
| 5 | -2 |
| 6 | -4 |
| 7 | 0 |
| 8 | 0 |
| 9 | -2 |
| 10 | 4 |
| 11 | 8 |
| 12 | 0 |
| 13 | 0 |
| 14 | 4 |
| 15 | -8 |
| 16 | -14 |
| 17 | 0 |
| 18 | 0 |
| 19 | -8 |
| 20 | 14 |
| 21 | 24 |
| 22 | 0 |
| 23 | 0 |
| 24 | 12 |
| 25 | -22 |
| 26 | -40 |
| 27 | 0 |
| 28 | 0 |
| 29 | -20 |
| 30 | 36 |
| 31 | 64 |
| 32 | 0 |
| 33 | 0 |
| 34 | 32 |
| 35 | -56 |
| 36 | -98 |
| 37 | 0 |
| 38 | 0 |
| 39 | -48 |
| 40 | 84 |
| 41 | 148 |
| 42 | 0 |
| 43 | 0 |
| 44 | 72 |
| 45 | -126 |
| 46 | -220 |
| 47 | 0 |
| 48 | 0 |
| 49 | -106 |
| 50 | 184 |
| 51 | 320 |
| 52 | 0 |
| 53 | 0 |
| 54 | 152 |
| 55 | -264 |
| 56 | -460 |
| 57 | 0 |
| 58 | 0 |
| 59 | -216 |
| 60 | 376 |
| 61 | 652 |
| 62 | 0 |
| 63 | 0 |
| 64 | 306 |
| 65 | -528 |