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 | 0 |
| 2 | 1 |
| 3 | -1 |
| 4 | 1 |
| 5 | -1 |
| 6 | 2 |
| 7 | -2 |
| 8 | 2 |
| 9 | -3 |
| 10 | 4 |
| 11 | -4 |
| 12 | 5 |
| 13 | -6 |
| 14 | 7 |
| 15 | -8 |
| 16 | 9 |
| 17 | -11 |
| 18 | 13 |
| 19 | -14 |
| 20 | 17 |
| 21 | -20 |
| 22 | 22 |
| 23 | -25 |
| 24 | 29 |
| 25 | -33 |
| 26 | 37 |
| 27 | -42 |
| 28 | 48 |
| 29 | -54 |
| 30 | 61 |
| 31 | -68 |
| 32 | 77 |
| 33 | -87 |
| 34 | 96 |
| 35 | -108 |
| 36 | 122 |
| 37 | -135 |
| 38 | 150 |
| 39 | -168 |
| 40 | 187 |
| 41 | -207 |
| 42 | 230 |
| 43 | -255 |
| 44 | 283 |
| 45 | -313 |
| 46 | 345 |
| 47 | -382 |
| 48 | 422 |
| 49 | -464 |
| 50 | 511 |
| 51 | -564 |
| 52 | 620 |
| 53 | -680 |
| 54 | 748 |
| 55 | -821 |
| 56 | 900 |
| 57 | -986 |
| 58 | 1079 |
| 59 | -1182 |
| 60 | 1293 |
| 61 | -1411 |
| 62 | 1542 |