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 | 0 |
| 3 | -1 |
| 4 | -2 |
| 5 | -1 |
| 6 | 1 |
| 7 | 3 |
| 8 | 3 |
| 9 | 1 |
| 10 | -3 |
| 11 | -6 |
| 12 | -5 |
| 13 | 1 |
| 14 | 9 |
| 15 | 12 |
| 16 | 5 |
| 17 | -9 |
| 18 | -20 |
| 19 | -18 |
| 20 | 1 |
| 21 | 26 |
| 22 | 38 |
| 23 | 21 |
| 24 | -21 |
| 25 | -61 |
| 26 | -62 |
| 27 | -9 |
| 28 | 72 |
| 29 | 120 |
| 30 | 81 |
| 31 | -44 |
| 32 | -177 |
| 33 | -205 |
| 34 | -64 |
| 35 | 186 |
| 36 | 366 |
| 37 | 293 |
| 38 | -63 |
| 39 | -496 |
| 40 | -657 |
| 41 | -304 |
| 42 | 445 |
| 43 | 1084 |
| 44 | 1014 |
| 45 | 33 |
| 46 | -1341 |
| 47 | -2053 |
| 48 | -1238 |
| 49 | 959 |
| 50 | 3132 |
| 51 | 3378 |
| 52 | 770 |
| 53 | -3474 |
| 54 | -6260 |
| 55 | -4619 |
| 56 | 1656 |
| 57 | 8809 |
| 58 | 10929 |
| 59 | 4306 |
| 60 | -8520 |