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 | 0 |
| 2 | -2 |
| 3 | 0 |
| 4 | 3 |
| 5 | -5 |
| 6 | -4 |
| 7 | 10 |
| 8 | -3 |
| 9 | -15 |
| 10 | 25 |
| 11 | 9 |
| 12 | -47 |
| 13 | 37 |
| 14 | 55 |
| 15 | -118 |
| 16 | 28 |
| 17 | 182 |
| 18 | -231 |
| 19 | -88 |
| 20 | 484 |
| 21 | -351 |
| 22 | -474 |
| 23 | 1047 |
| 24 | -306 |
| 25 | -1479 |
| 26 | 1985 |
| 27 | 370 |
| 28 | -3657 |
| 29 | 3120 |
| 30 | 2757 |
| 31 | -7868 |
| 32 | 3686 |
| 33 | 8889 |
| 34 | -14950 |
| 35 | 1255 |
| 36 | 22540 |
| 37 | -25069 |
| 38 | -9557 |
| 39 | 49333 |
| 40 | -35638 |
| 41 | -40172 |
| 42 | 96943 |
| 43 | -37509 |
| 44 | -111145 |
| 45 | 172256 |