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 | -4 |
| 4 | 3 |
| 5 | -2 |
| 6 | -6 |
| 7 | -4 |
| 8 | 7 |
| 9 | -12 |
| 10 | -10 |
| 11 | -16 |
| 12 | 16 |
| 13 | -14 |
| 14 | -20 |
| 15 | -20 |
| 16 | 29 |
| 17 | -40 |
| 18 | -40 |
| 19 | -52 |
| 20 | 52 |
| 21 | -52 |
| 22 | -70 |
| 23 | -68 |
| 24 | 91 |
| 25 | -114 |
| 26 | -116 |
| 27 | -148 |
| 28 | 149 |
| 29 | -152 |
| 30 | -190 |
| 31 | -196 |
| 32 | 242 |
| 33 | -296 |
| 34 | -306 |
| 35 | -368 |
| 36 | 383 |
| 37 | -396 |
| 38 | -478 |
| 39 | -496 |
| 40 | 590 |
| 41 | -698 |
| 42 | -730 |
| 43 | -856 |
| 44 | 897 |
| 45 | -940 |
| 46 | -1096 |
| 47 | -1152 |
| 48 | 1342 |
| 49 | -1548 |
| 50 | -1630 |
| 51 | -1876 |
| 52 | 1975 |
| 53 | -2080 |
| 54 | -2390 |
| 55 | -2516 |