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 | 0 |
| 4 | 1 |
| 5 | -2 |
| 6 | 1 |
| 7 | 0 |
| 8 | 2 |
| 9 | -4 |
| 10 | 2 |
| 11 | 0 |
| 12 | 4 |
| 13 | -10 |
| 14 | 7 |
| 15 | 0 |
| 16 | 7 |
| 17 | -23 |
| 18 | 22 |
| 19 | -6 |
| 20 | 14 |
| 21 | -51 |
| 22 | 59 |
| 23 | -24 |
| 24 | 31 |
| 25 | -113 |
| 26 | 152 |
| 27 | -80 |
| 28 | 66 |
| 29 | -244 |
| 30 | 383 |
| 31 | -253 |
| 32 | 166 |
| 33 | -521 |
| 34 | 930 |
| 35 | -746 |
| 36 | 460 |
| 37 | -1133 |
| 38 | 2219 |
| 39 | -2082 |
| 40 | 1314 |
| 41 | -2494 |
| 42 | 5208 |
| 43 | -5607 |
| 44 | 3788 |
| 45 | -5622 |
| 46 | 12037 |
| 47 | -14608 |
| 48 | 10830 |
| 49 | -13145 |
| 50 | 27618 |
| 51 | -37089 |
| 52 | 30350 |
| 53 | -31914 |
| 54 | 63248 |
| 55 | -92290 |