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 | 2 |
| 5 | -3 |
| 6 | 4 |
| 7 | -6 |
| 8 | 8 |
| 9 | -11 |
| 10 | 16 |
| 11 | -22 |
| 12 | 31 |
| 13 | -44 |
| 14 | 61 |
| 15 | -85 |
| 16 | 119 |
| 17 | -166 |
| 18 | 232 |
| 19 | -325 |
| 20 | 454 |
| 21 | -634 |
| 22 | 886 |
| 23 | -1237 |
| 24 | 1728 |
| 25 | -2415 |
| 26 | 3373 |
| 27 | -4712 |
| 28 | 6583 |
| 29 | -9194 |
| 30 | 12843 |
| 31 | -17941 |
| 32 | 25060 |
| 33 | -35006 |
| 34 | 48899 |
| 35 | -68303 |
| 36 | 95409 |
| 37 | -133272 |
| 38 | 186159 |
| 39 | -260036 |
| 40 | 363230 |
| 41 | -507373 |
| 42 | 708720 |
| 43 | -989969 |
| 44 | 1382827 |
| 45 | -1931590 |