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 | -2 |
| 6 | 0 |
| 7 | 0 |
| 8 | 1 |
| 9 | 0 |
| 10 | -2 |
| 11 | 4 |
| 12 | 0 |
| 13 | 2 |
| 14 | -8 |
| 15 | 0 |
| 16 | 1 |
| 17 | 2 |
| 18 | 0 |
| 19 | -4 |
| 20 | 14 |
| 21 | 0 |
| 22 | 4 |
| 23 | -24 |
| 24 | 0 |
| 25 | 1 |
| 26 | 6 |
| 27 | 0 |
| 28 | -8 |
| 29 | 38 |
| 30 | 0 |
| 31 | 8 |
| 32 | -63 |
| 33 | 0 |
| 34 | 2 |
| 35 | 16 |
| 36 | 0 |
| 37 | -14 |
| 38 | 92 |
| 39 | 0 |
| 40 | 14 |
| 41 | -150 |
| 42 | 0 |
| 43 | 4 |
| 44 | 36 |
| 45 | 0 |
| 46 | -24 |
| 47 | 208 |
| 48 | 0 |
| 49 | 23 |
| 50 | -329 |
| 51 | 0 |
| 52 | 6 |
| 53 | 78 |
| 54 | 0 |
| 55 | -40 |
| 56 | 440 |
| 57 | 0 |
| 58 | 38 |
| 59 | -684 |
| 60 | 0 |
| 61 | 10 |
| 62 | 160 |
| 63 | 0 |
| 64 | -63 |
| 65 | 884 |
| 66 | 0 |
| 67 | 60 |
| 68 | -1358 |
| 69 | 0 |