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 | 0 |
| 1 | 1 |
| 2 | -1 |
| 3 | 1 |
| 4 | -2 |
| 5 | 3 |
| 6 | -2 |
| 7 | 2 |
| 8 | -4 |
| 9 | 5 |
| 10 | -5 |
| 11 | 5 |
| 12 | -7 |
| 13 | 9 |
| 14 | -8 |
| 15 | 9 |
| 16 | -12 |
| 17 | 14 |
| 18 | -15 |
| 19 | 16 |
| 20 | -20 |
| 21 | 23 |
| 22 | -23 |
| 23 | 25 |
| 24 | -31 |
| 25 | 36 |
| 26 | -37 |
| 27 | 40 |
| 28 | -47 |
| 29 | 54 |
| 30 | -56 |
| 31 | 60 |
| 32 | -71 |
| 33 | 79 |
| 34 | -84 |
| 35 | 91 |
| 36 | -103 |
| 37 | 115 |
| 38 | -121 |
| 39 | 131 |
| 40 | -149 |
| 41 | 164 |
| 42 | -174 |
| 43 | 188 |
| 44 | -210 |
| 45 | 232 |
| 46 | -245 |
| 47 | 264 |
| 48 | -294 |
| 49 | 321 |
| 50 | -343 |
| 51 | 368 |
| 52 | -406 |
| 53 | 443 |
| 54 | -470 |
| 55 | 505 |
| 56 | -554 |
| 57 | 602 |
| 58 | -641 |
| 59 | 687 |
| 60 | -751 |
| 61 | 813 |
| 62 | -863 |
| 63 | 925 |