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 | -2 |
| 3 | 2 |
| 4 | 2 |
| 5 | -6 |
| 6 | 4 |
| 7 | 4 |
| 8 | -8 |
| 9 | 4 |
| 10 | 4 |
| 11 | -10 |
| 12 | 6 |
| 13 | 8 |
| 14 | -16 |
| 15 | 8 |
| 16 | 10 |
| 17 | -22 |
| 18 | 12 |
| 19 | 12 |
| 20 | -26 |
| 21 | 16 |
| 22 | 16 |
| 23 | -38 |
| 24 | 20 |
| 25 | 22 |
| 26 | -48 |
| 27 | 26 |
| 28 | 28 |
| 29 | -58 |
| 30 | 32 |
| 31 | 36 |
| 32 | -78 |
| 33 | 40 |
| 34 | 44 |
| 35 | -96 |
| 36 | 52 |
| 37 | 56 |
| 38 | -116 |
| 39 | 64 |
| 40 | 68 |
| 41 | -150 |
| 42 | 80 |
| 43 | 84 |
| 44 | -182 |
| 45 | 96 |
| 46 | 104 |
| 47 | -218 |
| 48 | 118 |
| 49 | 126 |
| 50 | -270 |
| 51 | 144 |
| 52 | 152 |
| 53 | -326 |
| 54 | 172 |
| 55 | 184 |
| 56 | -388 |
| 57 | 208 |
| 58 | 220 |
| 59 | -470 |
| 60 | 248 |