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 | -1 |
| 3 | 0 |
| 4 | 0 |
| 5 | 2 |
| 6 | 0 |
| 7 | 1 |
| 8 | 2 |
| 9 | -3 |
| 10 | 0 |
| 11 | 1 |
| 12 | -6 |
| 13 | -21 |
| 14 | -20 |
| 15 | 0 |
| 16 | -2 |
| 17 | -14 |
| 18 | 24 |
| 19 | 172 |
| 20 | 370 |
| 21 | 0 |
| 22 | -9 |
| 23 | 26 |
| 24 | 195 |
| 25 | 108 |
| 26 | -1105 |
| 27 | -4074 |
| 28 | 0 |
| 29 | -9 |
| 30 | 178 |
| 31 | -111 |
| 32 | -2388 |
| 33 | -4805 |
| 34 | 2046 |
| 35 | 34293 |
| 36 | 0 |
| 37 | 50 |
| 38 | 90 |
| 39 | -3072 |
| 40 | -3220 |
| 41 | 23670 |
| 42 | 87510 |
| 43 | 111860 |
| 44 | -138312 |
| 45 | 0 |
| 46 | 267 |
| 47 | -2382 |
| 48 | -4053 |
| 49 | 47532 |
| 50 | 121995 |
| 51 | -115458 |
| 52 | -1193157 |
| 53 | -2966088 |
| 54 | -2932533 |