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 | -2 |
| 2 | 1 |
| 3 | 0 |
| 4 | -2 |
| 5 | 2 |
| 6 | 2 |
| 7 | -4 |
| 8 | 3 |
| 9 | 4 |
| 10 | -8 |
| 11 | 4 |
| 12 | 5 |
| 13 | -14 |
| 14 | 7 |
| 15 | 8 |
| 16 | -20 |
| 17 | 12 |
| 18 | 14 |
| 19 | -28 |
| 20 | 17 |
| 21 | 20 |
| 22 | -44 |
| 23 | 24 |
| 24 | 28 |
| 25 | -66 |
| 26 | 36 |
| 27 | 40 |
| 28 | -90 |
| 29 | 52 |
| 30 | 56 |
| 31 | -124 |
| 32 | 71 |
| 33 | 80 |
| 34 | -176 |
| 35 | 96 |
| 36 | 109 |
| 37 | -244 |
| 38 | 133 |
| 39 | 144 |
| 40 | -326 |
| 41 | 182 |
| 42 | 198 |
| 43 | -432 |
| 44 | 240 |
| 45 | 268 |
| 46 | -580 |
| 47 | 316 |
| 48 | 349 |
| 49 | -772 |
| 50 | 420 |
| 51 | 456 |
| 52 | -1004 |
| 53 | 552 |
| 54 | 600 |
| 55 | -1300 |
| 56 | 713 |
| 57 | 780 |
| 58 | -1692 |
| 59 | 916 |
| 60 | 1001 |
| 61 | -2186 |
| 62 | 1182 |