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 | 0 |
| 5 | 2 |
| 6 | 2 |
| 7 | -1 |
| 8 | -3 |
| 9 | 0 |
| 10 | 5 |
| 11 | 4 |
| 12 | -4 |
| 13 | -8 |
| 14 | 1 |
| 15 | 13 |
| 16 | 8 |
| 17 | -13 |
| 18 | -20 |
| 19 | 6 |
| 20 | 34 |
| 21 | 15 |
| 22 | -39 |
| 23 | -48 |
| 24 | 25 |
| 25 | 88 |
| 26 | 24 |
| 27 | -112 |
| 28 | -111 |
| 29 | 89 |
| 30 | 224 |
| 31 | 23 |
| 32 | -312 |
| 33 | -246 |
| 34 | 290 |
| 35 | 559 |
| 36 | -43 |
| 37 | -848 |
| 38 | -515 |
| 39 | 892 |
| 40 | 1364 |
| 41 | -376 |
| 42 | -2255 |
| 43 | -987 |
| 44 | 2632 |
| 45 | 3243 |
| 46 | -1644 |
| 47 | -5874 |
| 48 | -1598 |
| 49 | 7519 |
| 50 | 7473 |
| 51 | -5920 |
| 52 | -14991 |
| 53 | -1552 |
| 54 | 20912 |
| 55 | 16544 |
| 56 | -19359 |
| 57 | -37455 |
| 58 | 2816 |
| 59 | 56815 |