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 | 1 |
| 5 | -1 |
| 6 | 0 |
| 7 | 1 |
| 8 | -2 |
| 9 | 3 |
| 10 | -4 |
| 11 | 5 |
| 12 | -5 |
| 13 | 4 |
| 14 | -2 |
| 15 | -2 |
| 16 | 7 |
| 17 | -13 |
| 18 | 19 |
| 19 | -24 |
| 20 | 27 |
| 21 | -25 |
| 22 | 17 |
| 23 | -2 |
| 24 | -20 |
| 25 | 48 |
| 26 | -80 |
| 27 | 110 |
| 28 | -132 |
| 29 | 137 |
| 30 | -116 |
| 31 | 62 |
| 32 | 30 |
| 33 | -158 |
| 34 | 314 |
| 35 | -479 |
| 36 | 622 |
| 37 | -704 |
| 38 | 680 |
| 39 | -507 |
| 40 | 150 |
| 41 | 405 |
| 42 | -1135 |
| 43 | 1973 |
| 44 | -2797 |
| 45 | 3432 |
| 46 | -3662 |
| 47 | 3250 |
| 48 | -1983 |
| 49 | -280 |
| 50 | 3540 |
| 51 | -7592 |
| 52 | 11977 |
| 53 | -15953 |