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 | 1 |
| 4 | -1 |
| 5 | 0 |
| 6 | 1 |
| 7 | -2 |
| 8 | 0 |
| 9 | 2 |
| 10 | -3 |
| 11 | 1 |
| 12 | 4 |
| 13 | -4 |
| 14 | 1 |
| 15 | 4 |
| 16 | -6 |
| 17 | 1 |
| 18 | 5 |
| 19 | -8 |
| 20 | 1 |
| 21 | 8 |
| 22 | -10 |
| 23 | 2 |
| 24 | 11 |
| 25 | -14 |
| 26 | 4 |
| 27 | 14 |
| 28 | -19 |
| 29 | 4 |
| 30 | 17 |
| 31 | -24 |
| 32 | 4 |
| 33 | 23 |
| 34 | -31 |
| 35 | 6 |
| 36 | 31 |
| 37 | -40 |
| 38 | 9 |
| 39 | 38 |
| 40 | -50 |
| 41 | 10 |
| 42 | 46 |
| 43 | -63 |
| 44 | 11 |
| 45 | 60 |
| 46 | -79 |
| 47 | 16 |
| 48 | 77 |
| 49 | -98 |
| 50 | 21 |
| 51 | 92 |
| 52 | -122 |
| 53 | 24 |
| 54 | 112 |
| 55 | -150 |
| 56 | 28 |
| 57 | 140 |
| 58 | -183 |
| 59 | 36 |
| 60 | 173 |
| 61 | -224 |
| 62 | 46 |
| 63 | 208 |
| 64 | -273 |
| 65 | 54 |
| 66 | 249 |
| 67 | -329 |
| 68 | 62 |
| 69 | 304 |
| 70 | -396 |
| 71 | 78 |
| 72 | 370 |
| 73 | -478 |
| 74 | 98 |