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 | -1 |
| 4 | 2 |
| 5 | -2 |
| 6 | 1 |
| 7 | -2 |
| 8 | 4 |
| 9 | -4 |
| 10 | 3 |
| 11 | -4 |
| 12 | 8 |
| 13 | -8 |
| 14 | 6 |
| 15 | -9 |
| 16 | 14 |
| 17 | -14 |
| 18 | 12 |
| 19 | -16 |
| 20 | 24 |
| 21 | -25 |
| 22 | 22 |
| 23 | -28 |
| 24 | 40 |
| 25 | -42 |
| 26 | 38 |
| 27 | -48 |
| 28 | 65 |
| 29 | -68 |
| 30 | 64 |
| 31 | -78 |
| 32 | 102 |
| 33 | -108 |
| 34 | 104 |
| 35 | -124 |
| 36 | 159 |
| 37 | -168 |
| 38 | 164 |
| 39 | -194 |
| 40 | 242 |
| 41 | -256 |
| 42 | 254 |
| 43 | -296 |
| 44 | 362 |
| 45 | -385 |
| 46 | 386 |
| 47 | -444 |
| 48 | 536 |
| 49 | -570 |
| 50 | 576 |
| 51 | -658 |
| 52 | 782 |
| 53 | -832 |
| 54 | 848 |
| 55 | -961 |